Expose synthetic delays through the GPU benchmarking extension

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 9e606f4d5ca2f56a1508a717aa31c1493a75988e..b363364b9d4cadad1c437ed7501a6381d6938a5d 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -13,6 +13,7 @@
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/debug/trace_event.h"
+#include "base/debug/trace_event.h"
 #include "base/i18n/rtl.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop/message_loop.h"
@@ -36,6 +37,7 @@
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_helper.h"
 #include "content/browser/renderer_host/render_widget_host_delegate.h"
+#include "content/browser/tracing/tracing_controller_impl.h"
 #include "content/common/accessibility_messages.h"
 #include "content/common/content_constants_internal.h"
 #include "content/common/gpu/gpu_messages.h"
@@ -467,6 +469,8 @@ bool RenderWidgetHostImpl::OnMessageReceived(const IPC::Message &msg) {
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateIsDelayed, OnUpdateIsDelayed)
     IPC_MESSAGE_HANDLER(ViewHostMsg_BeginSmoothScroll, OnBeginSmoothScroll)
     IPC_MESSAGE_HANDLER(ViewHostMsg_BeginPinch, OnBeginPinch)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_ConfigureSyntheticDelay,
+                        OnConfigureSyntheticDelay)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Focus, OnFocus)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Blur, OnBlur)
     IPC_MESSAGE_HANDLER(ViewHostMsg_SetCursor, OnSetCursor)
@@ -1726,6 +1730,15 @@ void RenderWidgetHostImpl::OnBeginPinch(
   synthetic_gesture_controller_.BeginPinch(view_, params);
 }
 
+void RenderWidgetHostImpl::OnConfigureSyntheticDelay(
+    const ViewHostMsg_ConfigureSyntheticDelay_Params& params) {
+  TracingControllerImpl::GetInstance()->ConfigureSyntheticDelay(
+      params.name, params.target_duration,
+      static_cast<base::debug::TraceEventSyntheticDelay::Mode>(params.mode),
+      base::Bind(&RenderWidgetHostImpl::DidConfigureSyntheticDelay,
+                 weak_factory_.GetWeakPtr()));
+}
+
 void RenderWidgetHostImpl::OnFocus() {
   // Only RenderViewHost can deal with that message.
   RecordAction(UserMetricsAction("BadMessageTerminate_RWH4"));
@@ -2457,6 +2470,10 @@ void RenderWidgetHostImpl::WindowSnapshotReachedScreen(int snapshot_id) {
       GetRoutingID(), snapshot_id, gfx::Size(), png));
 }
 
+void RenderWidgetHostImpl::DidConfigureSyntheticDelay() {
+  Send(new ViewMsg_ConfigureSyntheticDelayAck(GetRoutingID()));
+}
+
 // static
 void RenderWidgetHostImpl::CompositorFrameDrawn(
     const ui::LatencyInfo& latency_info) {