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 74aae79f48e2d3dfb8ab96b41942c94c1c4f9448..8a2a86d49fcefcaf085ef4e162ec3cfa66996fa1 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -20,9 +20,12 @@
 #include "base/values.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/mutation_conversions.h"
 #include "cc/blink/web_compositor_animation_timeline_impl.h"
 #include "cc/blink/web_layer_impl.h"
+#include "cc/blink/web_mutator_client_impl.h"
 #include "cc/debug/layer_tree_debug_state.h"
 #include "cc/debug/micro_benchmark.h"
 #include "cc/input/layer_selection_bound.h"
@@ -47,6 +50,7 @@
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "third_party/WebKit/public/platform/WebCompositeAndReadbackAsyncCallback.h"
 #include "third_party/WebKit/public/platform/WebLayoutAndPaintAsyncCallback.h"
+#include "third_party/WebKit/public/platform/WebMutatorClient.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
@@ -832,6 +836,12 @@ void RenderWidgetCompositor::setShowScrollBottleneckRects(bool show) {
   layer_tree_host_->SetDebugState(debug_state);
 }
 
+void RenderWidgetCompositor::setMutatorClient(blink::WebMutatorClient* client) {
+  TRACE_EVENT0("compositor-worker", "RenderWidgetCompositor::setMutatorClient");
+  layer_tree_host_->SetLayerTreeMutator(
+      static_cast<cc_blink::WebMutatorClientImpl*>(client));
+}
+
 void RenderWidgetCompositor::updateTopControlsState(
     WebTopControlsState constraints,
     WebTopControlsState current,
@@ -895,6 +905,15 @@ void RenderWidgetCompositor::ApplyViewportDeltas(
       top_controls_delta);
 }
 
+void RenderWidgetCompositor::ApplyMutations(
+    const cc::LayerTreeMutationMap& mutations) {
+  TRACE_EVENT0("compositor-worker",
+               "RenderWidgetCompositor::ApplyMutations");
+  blink::WebMutationMap blink_mutations;
+  cc_blink::convertToBlinkMutations(mutations, &blink_mutations);
+  widget_->webwidget()->applyMutations(blink_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
@@ -940,6 +959,7 @@ void RenderWidgetCompositor::DidCommit() {
   DCHECK(!temporary_copy_output_request_);
   widget_->DidCommitCompositorFrame();
   compositor_deps_->GetRendererScheduler()->DidCommitFrameToCompositor();
+  widget_->webwidget()->didCommit();
 }
 
 void RenderWidgetCompositor::DidCommitAndDrawFrame() {