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 67b3b1f22844cb16cf2282da6a2dd40c59bca25f..272b95a083eac9e1b94bc680561c7c2945cf8af0 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -39,6 +39,7 @@
 #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"
@@ -49,6 +50,7 @@
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_widget_host_iterator.h"
+#include "content/public/browser/tracing_synthetic_delay_configuration.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/common/content_switches.h"
@@ -469,6 +471,8 @@ bool RenderWidgetHostImpl::OnMessageReceived(const IPC::Message &msg) {
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidOverscroll, OnOverscrolled)
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateRect, OnUpdateRect)
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateIsDelayed, OnUpdateIsDelayed)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_ConfigureSyntheticDelays,
+                        OnConfigureSyntheticDelays)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Focus, OnFocus)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Blur, OnBlur)
     IPC_MESSAGE_HANDLER(ViewHostMsg_SetCursor, OnSetCursor)
@@ -1730,6 +1734,24 @@ void RenderWidgetHostImpl::OnQueueSyntheticGesture(
       SyntheticGesture::Create(*gesture_packet.gesture_params()));
 }
 
+void RenderWidgetHostImpl::OnConfigureSyntheticDelays(
+    const std::vector<content::SyntheticDelayConfiguration>& delays) {
+  std::vector<content::TracingSyntheticDelayConfiguration> tracing_delays;
+  for (size_t i = 0; i < delays.size(); i++) {
+    content::TracingSyntheticDelayConfiguration delay;
+    delay.name = delays[i].name;
+    delay.target_duration = delays[i].target_duration;
+    delay.mode =
+        static_cast<base::debug::TraceEventSyntheticDelay::Mode>(
+            delays[i].mode);
+    tracing_delays.push_back(delay);
+  }
+  TracingControllerImpl::GetInstance()->ConfigureSyntheticDelays(
+      tracing_delays,
+      base::Bind(&RenderWidgetHostImpl::DidConfigureSyntheticDelays,
+                 weak_factory_.GetWeakPtr()));
+}
+
 void RenderWidgetHostImpl::OnFocus() {
   // Only RenderViewHost can deal with that message.
   RecordAction(UserMetricsAction("BadMessageTerminate_RWH4"));
@@ -2464,6 +2486,10 @@ void RenderWidgetHostImpl::WindowSnapshotReachedScreen(int snapshot_id) {
       GetRoutingID(), snapshot_id, gfx::Size(), png));
 }
 
+void RenderWidgetHostImpl::DidConfigureSyntheticDelays() {
+  Send(new ViewMsg_ConfigureSyntheticDelaysAck(GetRoutingID()));
+}
+
 // static
 void RenderWidgetHostImpl::CompositorFrameDrawn(
     const ui::LatencyInfo& latency_info) {