UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2950.4 Safari/537.36

Steps to reproduce the problem:
WebKit/Source/platform/graphics/gpu/SharedGpuContext.h uses std::function, but doesn't include <functional>:

In file included from ../../third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.cpp:5:0:
../../third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.h:38:16: error: ‘function’ in namespace ‘std’ does not name a template type
   typedef std::function<std::unique_ptr<WebGraphicsContext3DProvider>()>
                ^~~~~~~~
../../third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.h:40:51: error: ‘ContextProviderFactory’ has not been declared
   static void setContextProviderFactoryForTesting(ContextProviderFactory);
                                                   ^~~~~~~~~~~~~~~~~~~~~~
../../third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.h:53:3: error: ‘ContextProviderFactory’ does not name a type
   ContextProviderFactory m_contextProviderFactory = nullptr;
   ^~~~~~~~~~~~~~~~~~~~~~
../../third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.cpp: In member function ‘void blink::SharedGpuContext::createContextProviderIfNeeded()’:
../../third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.cpp:48:7: error: ‘m_contextProviderFactory’ was not declared in this scope
   if (m_contextProviderFactory) {
       ^~~~~~~~~~~~~~~~~~~~~~~~
../../third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.cpp:48:7: note: suggested alternative: ‘m_contextProvider’
   if (m_contextProviderFactory) {
       ^~~~~~~~~~~~~~~~~~~~~~~~
       m_contextProvider
../../third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.cpp: At global scope:
../../third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.cpp:83:5: error: variable or field ‘setContextProviderFactoryForTesting’ declared void
     ContextProviderFactory factory) {
     ^~~~~~~~~~~~~~~~~~~~~~
../../third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContext.cpp:83:5: error: ‘ContextProviderFactory’ was not declared in this scope

What is the expected behavior?
adding "#include <functional>" to SharedGpuContext.h fixes the issue.

What went wrong?
_

Did this work before? N/A 

Chrome version: 57.0.2950.4  Channel: n/a
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