Move CanvasRenderingContext2D timer to frame-specific TaskRunnerTimer.

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp

Index: third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
diff --git a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
index 4e4b03d57b76e2eaa37d547fa080893c4da341d3..007a8fc475a84e2293d9e96898bb2dc387e8d647 100644
--- a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
+++ b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
@@ -41,6 +41,7 @@
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/StyleEngine.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/events/Event.h"
 #include "core/events/MouseEvent.h"
 #include "core/frame/Settings.h"
@@ -118,12 +119,18 @@ CanvasRenderingContext2D::CanvasRenderingContext2D(
       m_contextRestorable(true),
       m_tryRestoreContextAttemptCount(0),
       m_dispatchContextLostEventTimer(
+          TaskRunnerHelper::get(TaskType::MiscPlatformAPI,
+                                canvas->document().frame()),
           this,
           &CanvasRenderingContext2D::dispatchContextLostEvent),
       m_dispatchContextRestoredEventTimer(
+          TaskRunnerHelper::get(TaskType::MiscPlatformAPI,
+                                canvas->document().frame()),
           this,
           &CanvasRenderingContext2D::dispatchContextRestoredEvent),
       m_tryRestoreContextEventTimer(
+          TaskRunnerHelper::get(TaskType::MiscPlatformAPI,
+                                canvas->document().frame()),
           this,
           &CanvasRenderingContext2D::tryRestoreContextEvent),
       m_pruneLocalFontCacheScheduled(false) {