[DevTools] Handle emulation in embedder, call into web API.

content/renderer/devtools/devtools_agent.h

Index: content/renderer/devtools/devtools_agent.h
diff --git a/content/renderer/devtools/devtools_agent.h b/content/renderer/devtools/devtools_agent.h
index 8e0502fd96e90acf3f9d79df6319b274d992158a..931e643ce7c7a8a306a23d86f7be1d4fa4c2e106 100644
--- a/content/renderer/devtools/devtools_agent.h
+++ b/content/renderer/devtools/devtools_agent.h
@@ -13,6 +13,7 @@
 #include "content/public/common/console_message_level.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "third_party/WebKit/public/web/WebDevToolsAgentClient.h"
+#include "third_party/WebKit/public/web/WebDeviceEmulationParams.h"
 
 namespace blink {
 class WebDevToolsAgent;
@@ -86,6 +87,8 @@ class DevToolsAgent : public RenderFrameObserver,
                              const std::string& message);
   void ContinueProgram();
   void OnSetupDevToolsClient();
+  void OnEnableDeviceEmulation(const blink::WebDeviceEmulationParams& params);
+  void OnDisableDeviceEmulation();
 
   RenderViewImpl* GetRenderViewImpl();