cc: Added a trace event to capture gpu raterization time.

cc/resources/raster_worker_pool.cc

Index: cc/resources/raster_worker_pool.cc
diff --git a/cc/resources/raster_worker_pool.cc b/cc/resources/raster_worker_pool.cc
index 7403f6d26637507f663e39a878d82f191daa70a0..c1235fc9881e5e12c62172dae72886d7feaeeed9 100644
--- a/cc/resources/raster_worker_pool.cc
+++ b/cc/resources/raster_worker_pool.cc
@@ -183,6 +183,10 @@ class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
 
   virtual void RunOnOriginThread(ResourceProvider* resource_provider,
                                  ContextProvider* context_provider) OVERRIDE {
+    TRACE_EVENT1("cc",
+                 "RasterWorkerPoolTaskImpl::RunOnOriginThread",
+                 "data",
+                 TracedValue::FromValue(DataAsValue().release()));
     // TODO(alokp): For now run-on-origin-thread implies gpu rasterization.
     DCHECK(use_gpu_rasterization());
     ResourceProvider::ScopedWriteLockGL lock(resource_provider,