This has been found doing local build with GCC. It seems to be a regression caused by this:
commit f3ce2901174c13c13a318dc68f5473cad413199b
Author: Yuta Kitamura <yutak@chromium.org>
Date:   Thu Nov 9 09:02:40 2017 +0000

    Split WTF::CrossThreadFunction out of WTF::Function.
    
    This patch is largely based on tzik's WIP patch:
    https://chromium-review.googlesource.com/c/chromium/src/+/746381
    
    Bug:  771087 
    Change-Id: I973e7b567995371b72061903d6c267b08c2ec571
    Reviewed-on: https://chromium-review.googlesource.com/759763
    Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
    Reviewed-by: Kentaro Hara <haraken@chromium.org>
    Commit-Queue: Yuta Kitamura <yutak@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#515125}


This is the build error log:

In file included from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/HeapAllocator.h:10:0,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Handle.h:35,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/bindings/ActiveScriptWrappable.h:9,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/bindings/WrapperTypeInfo.h:35,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/bindings/V8PerContextData.h:42,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/bindings/ScriptState.h:12,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ScriptValue.h:36,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ScriptFunction.h:34,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ScriptPromise.h:34,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ExceptionState.h:34,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/GeneratedCodeHelper.h:14,
                 from gen/blink/bindings/modules/v8/V8WindowPartial.h:14,
                 from gen/blink/bindings/modules/v8/V8WindowPartial.cpp:11:
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h: In instantiation of 'void blink::PersistentBase<T, weaknessConfiguration, crossThreadnessConfiguration>::TracePersistent(VisitorDispatcher) [with VisitorDispatcher = bli
nk::Visitor*; T = blink::SQLTransactionBackend; blink::WeaknessPersistentConfiguration weaknessConfiguration = (blink::WeaknessPersistentConfiguration)0u; blink::CrossThreadnessPersistentConfiguration crossThreadnessConfiguration = (blink::CrossThreadnessPersistentConfigu
ration)1u]':
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:223:64:   required from 'void blink::PersistentBase<T, weaknessConfiguration, crossThreadnessConfiguration>::Initialize() [with T = blink::SQLTransactionBackend; blink::W
eaknessPersistentConfiguration weaknessConfiguration = (blink::WeaknessPersistentConfiguration)0u; blink::CrossThreadnessPersistentConfiguration crossThreadnessConfiguration = (blink::CrossThreadnessPersistentConfiguration)1u]'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:46:15:   required from 'blink::PersistentBase<T, weaknessConfiguration, crossThreadnessConfiguration>::PersistentBase() [with T = blink::SQLTransactionBackend; blink::Wea
knessPersistentConfiguration weaknessConfiguration = (blink::WeaknessPersistentConfiguration)0u; blink::CrossThreadnessPersistentConfiguration crossThreadnessConfiguration = (blink::CrossThreadnessPersistentConfiguration)1u]'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:442:36:   required from 'blink::CrossThreadPersistent<T>::CrossThreadPersistent() [with T = blink::SQLTransactionBackend]'
/home/dape/Development/rpi/poky-pyro/build/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/chromium-ozone-igalia/64.0.3267.0.r515863.igalia.1-r0/recipe-sysroot/usr/include/c++/6.3.0/type_traits:1360:12:   required from 'struct std::is_trivially_constructible<blink::Cros
sThreadPersistent<blink::SQLTransactionBackend> >'
/home/dape/Development/rpi/poky-pyro/build/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/chromium-ozone-igalia/64.0.3267.0.r515863.igalia.1-r0/recipe-sysroot/usr/include/c++/6.3.0/type_traits:1367:12:   required from 'struct std::is_trivially_default_constructible<bli
nk::CrossThreadPersistent<blink::SQLTransactionBackend> >'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/wtf/VectorTraits.h:36:25:   required from 'constexpr const bool WTF::VectorTraitsBase<blink::CrossThreadPersistent<blink::SQLTransactionBackend> >::kCanInitializeWithMemset'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/wtf/Deque.h:150:21:   required from 'class WTF::Deque<blink::CrossThreadPersistent<blink::SQLTransactionBackend> >'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/modules/webdatabase/Database.h:204:55:   required from here
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:205:25: error: invalid application of 'sizeof' to incomplete type 'blink::SQLTransactionBackend'
     static_assert(sizeof(T), "T must be fully defined");
                         ^
In file included from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/wtf/Allocator.h:9:0,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/NativeValueTraits.h:10,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ScriptValue.h:34,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ScriptFunction.h:34,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ScriptPromise.h:34,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ExceptionState.h:34,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/GeneratedCodeHelper.h:14,
                 from gen/blink/bindings/modules/v8/V8WindowPartial.h:14,
                 from gen/blink/bindings/modules/v8/V8WindowPartial.cpp:11:
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/wtf/TypeTraits.h: In instantiation of 'class WTF::IsGarbageCollectedType<blink::SQLTransactionBackend>':
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:212:5:   required from 'void blink::PersistentBase<T, weaknessConfiguration, crossThreadnessConfiguration>::TracePersistent(VisitorDispatcher) [with VisitorDispatcher = blink::Visitor*; T = blink::SQLTransactionBackend; blink::WeaknessPersistentConfiguration weaknessConfiguration = (blink::WeaknessPersistentConfiguration)0u; blink::CrossThreadnessPersistentConfiguration crossThreadnessConfiguration = (blink::CrossThreadnessPersistentConfiguration)1u]'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:223:64:   required from 'void blink::PersistentBase<T, weaknessConfiguration, crossThreadnessConfiguration>::Initialize() [with T = blink::SQLTransactionBackend; blink::WeaknessPersistentConfiguration weaknessConfiguration = (blink::WeaknessPersistentConfiguration)0u; blink::CrossThreadnessPersistentConfiguration crossThreadnessConfiguration = (blink::CrossThreadnessPersistentConfiguration)1u]'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:46:15:   required from 'blink::PersistentBase<T, weaknessConfiguration, crossThreadnessConfiguration>::PersistentBase() [with T = blink::SQLTransactionBackend; blink::WeaknessPersistentConfiguration weaknessConfiguration = (blink::WeaknessPersistentConfiguration)0u; blink::CrossThreadnessPersistentConfiguration crossThreadnessConfiguration = (blink::CrossThreadnessPersistentConfiguration)1u]'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:442:36:   required from 'blink::CrossThreadPersistent<T>::CrossThreadPersistent() [with T = blink::SQLTransactionBackend]'
/home/dape/Development/rpi/poky-pyro/build/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/chromium-ozone-igalia/64.0.3267.0.r515863.igalia.1-r0/recipe-sysroot/usr/include/c++/6.3.0/type_traits:1360:12:   required from 'struct std::is_trivially_constructible<blink::CrossThreadPersistent<blink::SQLTransactionBackend> >'
/home/dape/Development/rpi/poky-pyro/build/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/chromium-ozone-igalia/64.0.3267.0.r515863.igalia.1-r0/recipe-sysroot/usr/include/c++/6.3.0/type_traits:1367:12:   required from 'struct std::is_trivially_default_constructible<blink::CrossThreadPersistent<blink::SQLTransactionBackend> >'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/wtf/VectorTraits.h:36:25:   required from 'constexpr const bool WTF::VectorTraitsBase<blink::CrossThreadPersistent<blink::SQLTransactionBackend> >::kCanInitializeWithMemset'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/wtf/Deque.h:150:21:   required from 'class WTF::Deque<blink::CrossThreadPersistent<blink::SQLTransactionBackend> >'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/modules/webdatabase/Database.h:204:55:   required from here
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/wtf/TypeTraits.h:273:23: error: invalid application of 'sizeof' to incomplete type 'blink::SQLTransactionBackend'
   static_assert(sizeof(T), "T must be fully defined");
                       ^
In file included from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/HeapAllocator.h:10:0,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Handle.h:35,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/bindings/ActiveScriptWrappable.h:9,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/bindings/WrapperTypeInfo.h:35,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/bindings/V8PerContextData.h:42,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/bindings/ScriptState.h:12,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ScriptValue.h:36,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ScriptFunction.h:34,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ScriptPromise.h:34,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/ExceptionState.h:34,
                 from ../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/bindings/core/v8/GeneratedCodeHelper.h:14,
                 from gen/blink/bindings/modules/v8/V8WindowPartial.h:14,
                 from gen/blink/bindings/modules/v8/V8WindowPartial.cpp:11:
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h: In instantiation of 'void blink::PersistentBase<T, weaknessConfiguration, crossThreadnessConfiguration>::TracePersistent(VisitorDispatcher) [with VisitorDispatcher = blink::Visitor*; T = blink::SQLTransactionBackend; blink::WeaknessPersistentConfiguration weaknessConfiguration = (blink::WeaknessPersistentConfiguration)0u; blink::CrossThreadnessPersistentConfiguration crossThreadnessConfiguration = (blink::CrossThreadnessPersistentConfiguration)1u]':
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:223:64:   required from 'void blink::PersistentBase<T, weaknessConfiguration, crossThreadnessConfiguration>::Initialize() [with T = blink::SQLTransactionBackend; blink::WeaknessPersistentConfiguration weaknessConfiguration = (blink::WeaknessPersistentConfiguration)0u; blink::CrossThreadnessPersistentConfiguration crossThreadnessConfiguration = (blink::CrossThreadnessPersistentConfiguration)1u]'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:46:15:   required from 'blink::PersistentBase<T, weaknessConfiguration, crossThreadnessConfiguration>::PersistentBase() [with T = blink::SQLTransactionBackend; blink::WeaknessPersistentConfiguration weaknessConfiguration = (blink::WeaknessPersistentConfiguration)0u; blink::CrossThreadnessPersistentConfiguration crossThreadnessConfiguration = (blink::CrossThreadnessPersistentConfiguration)1u]'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:442:36:   required from 'blink::CrossThreadPersistent<T>::CrossThreadPersistent() [with T = blink::SQLTransactionBackend]'
/home/dape/Development/rpi/poky-pyro/build/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/chromium-ozone-igalia/64.0.3267.0.r515863.igalia.1-r0/recipe-sysroot/usr/include/c++/6.3.0/type_traits:1360:12:   required from 'struct std::is_trivially_constructible<blink::CrossThreadPersistent<blink::SQLTransactionBackend> >'
/home/dape/Development/rpi/poky-pyro/build/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/chromium-ozone-igalia/64.0.3267.0.r515863.igalia.1-r0/recipe-sysroot/usr/include/c++/6.3.0/type_traits:1367:12:   required from 'struct std::is_trivially_default_constructible<blink::CrossThreadPersistent<blink::SQLTransactionBackend> >'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/wtf/VectorTraits.h:36:25:   required from 'constexpr const bool WTF::VectorTraitsBase<blink::CrossThreadPersistent<blink::SQLTransactionBackend> >::kCanInitializeWithMemset'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/wtf/Deque.h:150:21:   required from 'class WTF::Deque<blink::CrossThreadPersistent<blink::SQLTransactionBackend> >'
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/modules/webdatabase/Database.h:204:55:   required from here
../../../../../../../../../upstream-chromium/src/third_party/WebKit/Source/platform/heap/Persistent.h:206:5: error: static assertion failed: T needs to be a garbage collected object
     static_assert(IsGarbageCollectedType<T>::value,
     ^~~~~~~~~~~~~