[cc] Trace detailed tile info when --trace-all-rendered-frames

content/renderer/gpu/gpu_benchmarking_extension.cc

Index: content/renderer/gpu/gpu_benchmarking_extension.cc
diff --git a/content/renderer/gpu/gpu_benchmarking_extension.cc b/content/renderer/gpu/gpu_benchmarking_extension.cc
index 299c5f37476c025ccb57ef69c7ed1f1a64c328e2..8d45c727a5fc1850921f9ba0f33262e2bfa44abe 100644
--- a/content/renderer/gpu/gpu_benchmarking_extension.cc
+++ b/content/renderer/gpu/gpu_benchmarking_extension.cc
@@ -11,8 +11,10 @@
 #include "base/file_util.h"
 #include "base/memory/scoped_vector.h"
 #include "base/string_number_conversions.h"
+#include "cc/layer_tree_host.h"
 #include "content/common/gpu/gpu_rendering_stats.h"
 #include "content/public/renderer/render_thread.h"
+#include "content/public/renderer/v8_value_converter.h"
 #include "content/renderer/all_rendering_benchmarks.h"
 #include "content/renderer/render_view_impl.h"
 #include "content/renderer/rendering_benchmark.h"
@@ -23,10 +25,12 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebViewBenchmarkSupport.h"
 #include "v8/include/v8.h"
+#include "webkit/compositor_bindings/web_layer_tree_view_impl.h"
 #include "webkit/compositor_bindings/web_rendering_stats_impl.h"
 
 using WebKit::WebCanvas;
 using WebKit::WebFrame;
+using WebKit::WebLayerTreeViewImpl;
 using WebKit::WebPrivatePtr;
 using WebKit::WebRenderingStatsImpl;
 using WebKit::WebSize;
@@ -154,6 +158,10 @@ class GpuBenchmarkingWrapper : public v8::Extension {
           "chrome.gpuBenchmarking.beginWindowSnapshotPNG = function(callback) {"
           "  native function BeginWindowSnapshotPNG();"
           "  BeginWindowSnapshotPNG(callback);"
+          "};"
+          "chrome.gpuBenchmarking.layerTreeAsValue = function() {"
+          "  native function LayerTreeAsValue();"
+          "  LayerTreeAsValue();"
           "};") {}
 
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
@@ -168,6 +176,8 @@ class GpuBenchmarkingWrapper : public v8::Extension {
       return v8::FunctionTemplate::New(RunRenderingBenchmarks);
     if (name->Equals(v8::String::New("BeginWindowSnapshotPNG")))
       return v8::FunctionTemplate::New(BeginWindowSnapshotPNG);
+    if (name->Equals(v8::String::New("LayerTreeAsValue")))
+      return v8::FunctionTemplate::New(LayerTreeAsValue);
 
     return v8::Handle<v8::FunctionTemplate>();
   }
@@ -443,6 +453,38 @@ class GpuBenchmarkingWrapper : public v8::Extension {
 
     return v8::Undefined();
   }
+
+  static v8::Handle<v8::Value> LayerTreeAsValue(
+      const v8::Arguments& args) {
+    WebFrame* web_frame = WebFrame::frameForCurrentContext();
+    if (!web_frame)
+      return v8::Undefined();
+
+    WebView* web_view = web_frame->view();
+    if (!web_view)
+      return v8::Undefined();
+
+    RenderViewImpl* render_view_impl = RenderViewImpl::FromWebView(web_view);
+    if (!render_view_impl)
+      return v8::Undefined();
+
+    WebLayerTreeViewImpl* layer_tree_view_impl =
+        static_cast<WebLayerTreeViewImpl*>(render_view_impl->layerTreeView());
+
+    if (!layer_tree_view_impl)
+      return v8::Undefined();
+
+    cc::LayerTreeHost* cc_layer_tree_host =
+      layer_tree_view_impl->layer_tree_host();
+    if (!cc_layer_tree_host)
+      return v8::Undefined();
+
+    scoped_ptr<base::Value> value = cc_layer_tree_host->asValue();
+    scoped_ptr<V8ValueConverter> converter(V8ValueConverter::create());
+    v8::Persistent<v8::Context> context =
+        v8::Persistent<v8::Context>::New(web_frame->mainWorldScriptContext());
+    return converter->ToV8Value(value.get(), context);
+  }
 };
 
 v8::Extension* GpuBenchmarkingExtension::Get() {