WIP - compositor worker mega patch.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 4048e3b6ffddd6a697ba655bed0f423f2a982f92..8e08d63e35dec9616ab2ba12dd65dd05730a4aec 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -23,6 +23,7 @@
 #include "build/build_config.h"
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_timeline.h"
+#include "cc/animation/layer_tree_mutator.h"
 #include "cc/base/switches.h"
 #include "cc/blink/web_compositor_animation_timeline_impl.h"
 #include "cc/blink/web_layer_impl.h"
@@ -48,6 +49,8 @@
 #include "content/renderer/input/input_handler_manager.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
+#include "third_party/WebKit/public/platform/WebCompositorMutations.h"
+#include "third_party/WebKit/public/platform/WebCompositorMutatorClient.h"
 #include "third_party/WebKit/public/platform/WebCompositeAndReadbackAsyncCallback.h"
 #include "third_party/WebKit/public/platform/WebLayoutAndPaintAsyncCallback.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
@@ -847,6 +850,12 @@ void RenderWidgetCompositor::setShowScrollBottleneckRects(bool show) {
   layer_tree_host_->SetDebugState(debug_state);
 }
 
+void RenderWidgetCompositor::setMutatorClient(
+    blink::WebCompositorMutatorClient* client) {
+  TRACE_EVENT0("compositor-worker", "RenderWidgetCompositor::setMutatorClient");
+  layer_tree_host_->SetLayerTreeMutator(client);
+}
+
 void RenderWidgetCompositor::updateTopControlsState(
     WebTopControlsState constraints,
     WebTopControlsState current,
@@ -911,6 +920,14 @@ void RenderWidgetCompositor::ApplyViewportDeltas(
       top_controls_delta);
 }
 
+void RenderWidgetCompositor::ApplyMutations(
+    const cc::LayerTreeMutations& mutations) {
+  TRACE_EVENT0("compositor-worker",
+               "RenderWidgetCompositor::ApplyMutations");
+  widget_->webwidget()->applyMutations(
+      static_cast<const blink::WebCompositorMutations&>(mutations));
+}
+
 void RenderWidgetCompositor::RequestNewOutputSurface() {
   // If the host is closing, then no more compositing is possible.  This
   // prevents shutdown races between handling the close message and
@@ -956,6 +973,7 @@ void RenderWidgetCompositor::DidCommit() {
   DCHECK(!temporary_copy_output_request_);
   widget_->DidCommitCompositorFrame();
   compositor_deps_->GetRendererScheduler()->DidCommitFrameToCompositor();
+  widget_->webwidget()->didCommit();
 }
 
 void RenderWidgetCompositor::DidCommitAndDrawFrame() {