[DevTools] Blink-side APIs for device metrics emulation in content.

public/web/WebDevToolsAgentClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 
 #ifndef WebDevToolsAgentClient_h
 #define WebDevToolsAgentClient_h
 
 #include "../platform/WebCString.h"
 #include "../platform/WebCommon.h"
 
 namespace WebKit {
 class WebString;
 struct WebDevToolsMessageData;
+struct WebRect;
+struct WebSize;
 
 class WebDevToolsAgentClient {
 public:
     virtual void sendMessageToInspectorFrontend(const WebString&) { }
     virtual void sendDebuggerOutput(const WebString&) { }
 
     // Returns the identifier of the entity hosting this agent.
     virtual int hostIdentifier() { return -1; }
 
     // Save the agent state in order to pass it later into WebDevToolsAgent::reattach
@@ skipping 26 matching lines @@
         virtual ~InstrumentedObjectSizeProvider() { }
     };
     virtual void dumpUncountedAllocatedObjects(const InstrumentedObjectSizeProvider*) { }
 
     typedef void (*TraceEventCallback)(char phase, const unsigned char*, const char* name, unsigned long long id,
         int numArgs, const char* const* argNames, const unsigned char* argTypes, const unsigned long long* argValues,
         unsigned char flags);
 
     virtual void setTraceEventCallback(TraceEventCallback) { }
 
+    // Called to emulate device dimensions, scale factor and input. Window should
+    // occupy the whole device screen, while the view should be located at |viewRect|.
+    // With |fitToView| set, contents should be scaled down to fit into embedder window.
+    // All sizes are measured in device independent pixels.
+    virtual void enableDeviceEmulation(
+        const WebSize& screenSize, const WebRect& viewRect,
+        float deviceScaleFactor, bool fitToView) { }
+    virtual void disableDeviceEmulation() { }
+
 protected:
     ~WebDevToolsAgentClient() { }
 };
 
 } // namespace WebKit
 
 #endif