Timeline: add support for deferred canvas rasterization

Source/core/inspector/InspectorTimelineAgent.cpp

Index: Source/core/inspector/InspectorTimelineAgent.cpp
diff --git a/Source/core/inspector/InspectorTimelineAgent.cpp b/Source/core/inspector/InspectorTimelineAgent.cpp
index 09db80d4f67f51487045cae4e615be43d1a3ce72..506bc1afe4db6271025efe7f184ac40b93b2d3b9 100644
--- a/Source/core/inspector/InspectorTimelineAgent.cpp
+++ b/Source/core/inspector/InspectorTimelineAgent.cpp
@@ -369,6 +369,16 @@ void InspectorTimelineAgent::willPaint(RenderObject* renderer)
     pushCurrentRecord(InspectorObject::create(), TimelineRecordType::Paint, true, frame, true);
 }
 
+void InspectorTimelineAgent::willUpdateLayer(int)
+{
+    enablePlatformInstrumentation();
+}
+
+void InspectorTimelineAgent::didUpdateLayer()
+{
+    disablePlatformInstrumentation();
+}
+
 void InspectorTimelineAgent::didPaint(RenderObject* renderer, GraphicsContext*, const LayoutRect& clipRect)
 {
     TimelineRecordEntry& entry = m_recordStack.last();
@@ -409,6 +419,16 @@ void InspectorTimelineAgent::didResizeImage()
     didCompleteCurrentRecord(TimelineRecordType::ResizeImage);
 }
 
+void InspectorTimelineAgent::willRasterizeCanvas()
+{
+    pushCurrentRecord(InspectorObject::create(), TimelineRecordType::Rasterize, false, 0);
+}
+
+void InspectorTimelineAgent::didRasterizeCanvas()
+{
+    didCompleteCurrentRecord(TimelineRecordType::Rasterize);
+}
+
 void InspectorTimelineAgent::willComposite()
 {
     pushCurrentRecord(InspectorObject::create(), TimelineRecordType::CompositeLayers, false, 0);
@@ -712,10 +732,7 @@ void InspectorTimelineAgent::didCompleteCurrentRecord(const String& type)
     // An empty stack could merely mean that the timeline agent was turned on in the middle of
     // an event.  Don't treat as an error.
     if (!m_recordStack.isEmpty()) {
-        if (m_platformInstrumentationClientInstalledAtStackDepth == m_recordStack.size()) {
-            m_platformInstrumentationClientInstalledAtStackDepth = 0;
-            PlatformInstrumentation::setClient(0);
-        }
+        disablePlatformInstrumentation();
 
         pushGCEventRecords();
         TimelineRecordEntry entry = m_recordStack.last();
@@ -770,9 +787,23 @@ void InspectorTimelineAgent::pushCurrentRecord(PassRefPtr<InspectorObject> data,
     RefPtr<InspectorObject> record = TimelineRecordFactory::createGenericRecord(timestamp(), captureCallStack ? m_maxCallStackDepth : 0, type);
     setFrameIdentifier(record.get(), frame);
     m_recordStack.append(TimelineRecordEntry(record.release(), data, InspectorArray::create(), type, getUsedHeapSize()));
-    if (hasLowLevelDetails && !m_platformInstrumentationClientInstalledAtStackDepth && !PlatformInstrumentation::hasClient()) {
-        m_platformInstrumentationClientInstalledAtStackDepth = m_recordStack.size();
-        PlatformInstrumentation::setClient(this);
+    if (hasLowLevelDetails)
+        enablePlatformInstrumentation();
+}
+
+void InspectorTimelineAgent::enablePlatformInstrumentation()
+{
+    if (m_platformInstrumentationClientInstalledAtStackDepth || PlatformInstrumentation::hasClient())
+        return;
+    m_platformInstrumentationClientInstalledAtStackDepth = m_recordStack.size();
+    PlatformInstrumentation::setClient(this);
+}
+
+void InspectorTimelineAgent::disablePlatformInstrumentation()
+{
+    if (m_platformInstrumentationClientInstalledAtStackDepth == m_recordStack.size()) {
+        m_platformInstrumentationClientInstalledAtStackDepth = 0;
+        PlatformInstrumentation::setClient(0);
     }
 }