Adds BeginFrameControl via DevTools.

content/browser/devtools/protocol/emulation_handler.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DEVTOOLS_PROTOCOL_EMULATION_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_EMULATION_HANDLER_H_
 
 #include "base/macros.h"
+#include "cc/scheduler/begin_frame_source.h"
+#include "cc/surfaces/frame_sink_id.h"
 #include "content/browser/devtools/protocol/devtools_protocol_dispatcher.h"
 #include "third_party/WebKit/public/web/WebDeviceEmulationParams.h"
 
 namespace content {
 
 class RenderFrameHostImpl;
 class WebContentsImpl;
 
 namespace devtools {
 
 namespace page { class PageHandler; }
 
 namespace emulation {
 
-class EmulationHandler {
+class EmulatedBeginFrameSource;
+
+class EmulationHandler : public cc::ExternalBeginFrameSourceClient {
  public:
   using Response = DevToolsProtocolClient::Response;
 
   EmulationHandler();
   ~EmulationHandler();
 
   void SetRenderFrameHost(RenderFrameHostImpl* host);
-  void SetClient(std::unique_ptr<Client> client) { }
+  void SetClient(std::unique_ptr<Client> client);
   void Detached();
 
   Response SetGeolocationOverride(double* latitude,
                                   double* longitude,
                                   double* accuracy);
   Response ClearGeolocationOverride();
 
   Response SetTouchEmulationEnabled(bool enabled,
                                     const std::string* configuration);
 
@@ skipping 18 matching lines @@
 
   Response ForceViewport(double x, double y, double scale);
   Response ResetViewport();
   Response ResetPageScaleFactor();
   Response SetPageScaleFactor(double page_scale_factor);
   Response SetScriptExecutionDisabled(bool disabled);
   Response SetEmulatedMedia(const std::string& media);
   Response SetCPUThrottlingRate(double rate);
   Response SetVirtualTimePolicy(const std::string& policy, const int* budget);
 
+  Response EnableBeginFrameControl();
+  Response DisableBeginFrameControl();
+  Response SendBeginFrame(double interval,
+                          const double* frame_time,
+                          const double* deadline,
+                          std::string* out_frame_id);
+
+  void IssueBeginFrameOnSource(const cc::BeginFrameArgs& args);
+
+  // cc::ExternalBeginFrameSourceClient implementation:
+  void OnNeedsBeginFrames(bool needs_begin_frames) override;
+
  private:
+  void ClientSetNeedsBeginFrame(bool needs_begin_frame);
+  void ClientFrameCommitted(const std::string& frame_id);
+
   WebContentsImpl* GetWebContents();
   void UpdateTouchEventEmulationState();
   void UpdateDeviceEmulationState();
 
   bool touch_emulation_enabled_;
   std::string touch_emulation_configuration_;
 
   bool device_emulation_enabled_;
   blink::WebDeviceEmulationParams device_emulation_params_;
 
+  EmulatedBeginFrameSource* begin_frame_source_;  // Not owned.
+  std::unique_ptr<cc::BeginFrameSource> original_begin_frame_source_;
+  bool needs_begin_frame_;
+
   RenderFrameHostImpl* host_;
+  std::unique_ptr<Client> client_;
+  base::WeakPtrFactory<EmulationHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EmulationHandler);
 };
 
 }  // namespace emulation
 }  // namespace devtools
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_EMULATION_HANDLER_H_