[DevTools] Use device metrics emulation implemented in content.

public/web/WebDevToolsAgentClient.h

Index: public/web/WebDevToolsAgentClient.h
diff --git a/public/web/WebDevToolsAgentClient.h b/public/web/WebDevToolsAgentClient.h
index f8538735e5248ebfe6ddcbfc7829fc088fd19784..908527ef1e8e032818520b3b1563173a6b4044fb 100644
--- a/public/web/WebDevToolsAgentClient.h
+++ b/public/web/WebDevToolsAgentClient.h
@@ -37,6 +37,8 @@
 namespace WebKit {
 class WebString;
 struct WebDevToolsMessageData;
+struct WebRect;
+struct WebSize;
 
 class WebDevToolsAgentClient {
 public:
@@ -83,6 +85,15 @@ public:
 
     virtual void setTraceEventCallback(TraceEventCallback) { }
 
+    // Called to emulate device dimensions and scale factor. 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
+    // (see WebView::setDeviceEmulationParameters).
+    // All sizes are measured in device independent pixels.
+    virtual void emulateDevice(

[aelias_OOO_until_Jul13, 2013/10/01 08:08:51]

Please split into two methods:

virtual void enableScreenMetricsEmulation(const WebSize&...) { }
virtual void disableScreenMetricsEmulation() { }

[dgozman, 2013/10/01 15:26:34]

This method will also emulate device input in the near future. So, using
"device" instead of "screen metrics" here seems to be the right choice. I'd
split this into:
virtual void enableDeviceEmulation(const WebSize&...) { }
virtual void disableDeviceEmulation() { }

Comment updated to mention the device-like input.

+        bool enabled, const WebSize& screenSize, const WebRect& viewRect,
+        float deviceScaleFactor, bool fitToView) { }
+
 protected:
     ~WebDevToolsAgentClient() { }
 };