See https://build.chromium.org/p/chromium.memory.fyi/builders/Linux%20MSan%20Tests/builds/15017/steps/interactive_ui_tests%20on%20Ubuntu-12.04/logs/WebViewFocusInteractiveTest.Focus_FocusRestored:

[ RUN      ] WebViewFocusInteractiveTest.Focus_FocusRestored
...
==16072==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0xa3c0ebc in UpdateInputMethodIfNecessary content/browser/renderer_host/render_widget_host_view_aura.cc:869:33
    #1 0xa6fbe91 in UpdateTextInputState content/browser/web_contents/web_contents_impl.cc:2284:5
    #2 0xace3504 in DestroyGuestView content/browser/frame_host/render_widget_host_view_guest.cc:499:3
    #3 0xace3504 in RenderProcessGone content/browser/frame_host/render_widget_host_view_guest.cc:182:0
    #4 0xa399c37 in RendererExited content/browser/renderer_host/render_widget_host_impl.cc:1347:5
    #5 0xa3509f7 in RenderProcessExited content/browser/renderer_host/render_view_host_impl.cc:586:3
    #6 0xa3509f7 in ?? content/browser/renderer_host/render_view_host_impl.cc:580:0
    #7 0xa319fcf in ProcessDied content/browser/renderer_host/render_process_host_impl.cc:2423:3
    #8 0xa318d4b in FastShutdownIfPossible content/browser/renderer_host/render_process_host_impl.cc:1700:3
    #9 0x18995ed in OnShutdownStarting chrome/browser/browser_shutdown.cc:135:10
    #10 0x37dedd2 in OnWindowClosing chrome/browser/ui/browser.cc:704:5
    #11 0x34c6879 in CanClose chrome/browser/ui/views/frame/browser_view.cc:1913:5
    #12 0x31fbcf6 in Close ui/views/widget/widget.cc:563:17
    #13 0x1818469 in CloseBrowsers chrome/browser/lifetime/browser_close_manager.cc:166:5
    #14 0x1818e1b in TryToCloseBrowsers chrome/browser/lifetime/browser_close_manager.cc:79:3
    #15 0x14e9047 in CloseAllBrowsers chrome/browser/lifetime/application_lifetime.cc:144:3
    #16 0x14ea097 in AttemptExitInternal chrome/browser/lifetime/application_lifetime.cc:100:3
    #17 0x14ea097 in AttemptExit chrome/browser/lifetime/application_lifetime.cc:223:0
    #18 0x426b102 in Run base/callback.h:397:12
    #19 0x426b102 in RunTask base/debug/task_annotator.cc:51:0
    #20 0x40ca0ff in RunTask base/message_loop/message_loop.cc:479:3
    #21 0x40cbb17 in DeferOrRunPendingTask base/message_loop/message_loop.cc:488:5
    #22 0x40cc638 in DoWork base/message_loop/message_loop.cc:600:13
    #23 0x4264b49 in HandleDispatch base/message_loop/message_pump_glib.cc:267:7
    #24 0x4264b49 in WorkSourceDispatch base/message_loop/message_pump_glib.cc:109:0
    #25 0x7f51babbf803 in g_main_dispatch /mnt/b/chromium/src/out-msan-chained-origins-precise/Release/obj/third_party/instrumented_libraries/msan-libglib2.0-0.gen/libglib2.0-0/glib2.0-2.32.4/glib/gmain.c:2539:21
    #26 0x7f51babbf803 in g_main_context_dispatch /mnt/b/chromium/src/out-msan-chained-origins-precise/Release/obj/third_party/instrumented_libraries/msan-libglib2.0-0.gen/libglib2.0-0/glib2.0-2.32.4/glib/gmain.c:3075:0
    #27 0x7f51babc0bc9 in g_main_context_iterate /mnt/b/chromium/src/out-msan-chained-origins-precise/Release/obj/third_party/instrumented_libraries/msan-libglib2.0-0.gen/libglib2.0-0/glib2.0-2.32.4/glib/gmain.c:3146:5
    #28 0x7f51babc0f61 in g_main_context_iteration /mnt/b/chromium/src/out-msan-chained-origins-precise/Release/obj/third_party/instrumented_libraries/msan-libglib2.0-0.gen/libglib2.0-0/glib2.0-2.32.4/glib/gmain.c:3207:12
    #29 0x4263ddc in ?? base/message_loop/message_pump_glib.cc:309:30
    #30 0x414561b in Run base/run_loop.cc:35:3
    #31 0xdf83786 in RunThisRunLoop content/public/test/test_utils.cc:135:3
    #32 0xdf83604 in ?? content/public/test/test_utils.cc:122:3
    #33 0x1e7fe04 in QuitBrowsers chrome/test/base/in_process_browser_test.cc:599:3
    #34 0x1e7f58f in RunTestOnMainThreadLoop chrome/test/base/in_process_browser_test.cc:583:3
    #35 0x1e93773 in ProxyRunTestOnMainThreadLoop content/public/test/browser_test_base.cc:309:3
    #36 0x18f64d2 in Run base/callback.h:397:12
    #37 0x18f64d2 in PreMainMessageLoopRunImpl chrome/browser/chrome_browser_main.cc:1800:0
    #38 0x18f15cd in PreMainMessageLoopRun chrome/browser/chrome_browser_main.cc:1156:18
    #39 0xaa60a3e in PreMainMessageLoopRun content/browser/browser_main_loop.cc:928:5
    #40 0xb094bd7 in Run base/callback.h:397:12
    #41 0xb094bd7 in RunAllTasksNow content/browser/startup_task_runner.cc:45:0
    #42 0xaa586ff in CreateStartupTasks content/browser/browser_main_loop.cc:801:3
    #43 0xaa6e42f in Initialize content/browser/browser_main_runner.cc:139:5
    #44 0x16787195 in BrowserMain content/browser/browser_main.cc:41:19
    #45 0xdf694e2 in RunNamedProcessTypeMain content/app/content_main_runner.cc:380:14
    #46 0xdf6c943 in Run content/app/content_main_runner.cc:741:12
    #47 0xdf656c7 in ContentMain content/app/content_main.cc:19:15
    #48 0x1e929bf in SetUp content/public/test/browser_test_base.cc:282:3
    #49 0x1e7b05c in SetUp chrome/test/base/in_process_browser_test.cc:254:3
    #50 0x2a6e018 in HandleExceptionsInMethodIfSupported\u003Ctesting::Test, void> testing/gtest/src/gtest.cc:2458:12
    #51 0x2a6e018 in Run testing/gtest/src/gtest.cc:2470:0
    #52 0x2a71587 in Run testing/gtest/src/gtest.cc:2656:5
    #53 0x2a72dd3 in Run testing/gtest/src/gtest.cc:2774:5
    #54 0x2a9032e in RunAllTests testing/gtest/src/gtest.cc:4647:11
    #55 0x2a8f335 in HandleExceptionsInMethodIfSupported\u003Ctesting::internal::UnitTestImpl, bool> testing/gtest/src/gtest.cc:2458:12
    #56 0x2a8f335 in Run testing/gtest/src/gtest.cc:4255:0
    #57 0xdf228b3 in RUN_ALL_TESTS testing/gtest/include/gtest/gtest.h:2237:10
    #58 0xdf228b3 in Run base/test/test_suite.cc:230:0
    #59 0x969bf4 in RunTestSuite chrome/test/base/interactive_ui_tests_main.cc:74:12
    #60 0xdf778e4 in LaunchTests content/public/test/test_launcher.cc:517:12
    #61 0x9699db in main chrome/test/base/interactive_ui_tests_main.cc:86:22
    #62 0x7f51b2f5176c in __libc_start_main /build/eglibc-rrybNj/eglibc-2.15/csu/libc-start.c:226:0
    #63 0x4abdc0 in _start ??:0

  Uninitialized value was stored to memory at
    #0 0x4c9987 in __msan_memcpy ??:0
    #1 0xa6fbdd9 in operator= content/common/text_input_state.h:16:23
    #2 0xa6fbdd9 in UpdateTextInputState content/browser/web_contents/web_contents_impl.cc:2278:0
    #3 0xace3504 in DestroyGuestView content/browser/frame_host/render_widget_host_view_guest.cc:499:3
    #4 0xace3504 in RenderProcessGone content/browser/frame_host/render_widget_host_view_guest.cc:182:0
    #5 0xa399c37 in RendererExited content/browser/renderer_host/render_widget_host_impl.cc:1347:5
    #6 0xa3509f7 in RenderProcessExited content/browser/renderer_host/render_view_host_impl.cc:586:3
    #7 0xa3509f7 in ?? content/browser/renderer_host/render_view_host_impl.cc:580:0
    #8 0xa319fcf in ProcessDied content/browser/renderer_host/render_process_host_impl.cc:2423:3
    #9 0xa318d4b in FastShutdownIfPossible content/browser/renderer_host/render_process_host_impl.cc:1700:3
    #10 0x18995ed in OnShutdownStarting chrome/browser/browser_shutdown.cc:135:10
    #11 0x37dedd2 in OnWindowClosing chrome/browser/ui/browser.cc:704:5
    #12 0x34c6879 in CanClose chrome/browser/ui/views/frame/browser_view.cc:1913:5
    #13 0x31fbcf6 in Close ui/views/widget/widget.cc:563:17
    #14 0x1818469 in CloseBrowsers chrome/browser/lifetime/browser_close_manager.cc:166:5
    #15 0x1818e1b in TryToCloseBrowsers chrome/browser/lifetime/browser_close_manager.cc:79:3
    #16 0x14e9047 in CloseAllBrowsers chrome/browser/lifetime/application_lifetime.cc:144:3
    #17 0x14ea097 in AttemptExitInternal chrome/browser/lifetime/application_lifetime.cc:100:3
    #18 0x14ea097 in AttemptExit chrome/browser/lifetime/application_lifetime.cc:223:0
    #19 0x426b102 in Run base/callback.h:397:12
    #20 0x426b102 in RunTask base/debug/task_annotator.cc:51:0
    #21 0x40ca0ff in RunTask base/message_loop/message_loop.cc:479:3
    #22 0x40cbb17 in DeferOrRunPendingTask base/message_loop/message_loop.cc:488:5
    #23 0x40cc638 in DoWork base/message_loop/message_loop.cc:600:13
    #24 0x4264b49 in HandleDispatch base/message_loop/message_pump_glib.cc:267:7
    #25 0x4264b49 in WorkSourceDispatch base/message_loop/message_pump_glib.cc:109:0

  Uninitialized value was created by a heap allocation
    #0 0x513312 in operator new(unsigned long) ??:0
    #1 0xa3e51ac in NotifyHostDelegateAboutShutdown content/browser/renderer_host/render_widget_host_view_base.cc:84:27
    #2 0xace3504 in DestroyGuestView content/browser/frame_host/render_widget_host_view_guest.cc:499:3
    #3 0xace3504 in RenderProcessGone content/browser/frame_host/render_widget_host_view_guest.cc:182:0
    #4 0xa399c37 in RendererExited content/browser/renderer_host/render_widget_host_impl.cc:1347:5
    #5 0xa3509f7 in RenderProcessExited content/browser/renderer_host/render_view_host_impl.cc:586:3
    #6 0xa3509f7 in ?? content/browser/renderer_host/render_view_host_impl.cc:580:0
    #7 0xa319fcf in ProcessDied content/browser/renderer_host/render_process_host_impl.cc:2423:3
    #8 0xa318d4b in FastShutdownIfPossible content/browser/renderer_host/render_process_host_impl.cc:1700:3
    #9 0x18995ed in OnShutdownStarting chrome/browser/browser_shutdown.cc:135:10
    #10 0x37dedd2 in OnWindowClosing chrome/browser/ui/browser.cc:704:5
    #11 0x34c6879 in CanClose chrome/browser/ui/views/frame/browser_view.cc:1913:5
    #12 0x31fbcf6 in Close ui/views/widget/widget.cc:563:17
    #13 0x1818469 in CloseBrowsers chrome/browser/lifetime/browser_close_manager.cc:166:5
    #14 0x1818e1b in TryToCloseBrowsers chrome/browser/lifetime/browser_close_manager.cc:79:3
    #15 0x14e9047 in CloseAllBrowsers chrome/browser/lifetime/application_lifetime.cc:144:3
    #16 0x14ea097 in AttemptExitInternal chrome/browser/lifetime/application_lifetime.cc:100:3
    #17 0x14ea097 in AttemptExit chrome/browser/lifetime/application_lifetime.cc:223:0
    #18 0x426b102 in Run base/callback.h:397:12
    #19 0x426b102 in RunTask base/debug/task_annotator.cc:51:0
    #20 0x40ca0ff in RunTask base/message_loop/message_loop.cc:479:3
    #21 0x40cbb17 in DeferOrRunPendingTask base/message_loop/message_loop.cc:488:5
    #22 0x40cc638 in DoWork base/message_loop/message_loop.cc:600:13
    #23 0x4264b49 in HandleDispatch base/message_loop/message_pump_glib.cc:267:7
    #24 0x4264b49 in WorkSourceDispatch base/message_loop/message_pump_glib.cc:109:0

SUMMARY: MemorySanitizer: use-of-uninitialized-value (/tmp/run3j7HTg/out/Release/interactive_ui_tests+0xa3c0ebc)

Ehsan, can you please fix ASAP?