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

content/browser/devtools/protocol/page_handler.h

Index: content/browser/devtools/protocol/page_handler.h
diff --git a/content/browser/devtools/protocol/page_handler.h b/content/browser/devtools/protocol/page_handler.h
index 4ddb67d3d0c55b4d7ce048b0c4e3bd2415a3f693..f5035bae32a5ac5877545aa8b78cd960789d40b4 100644
--- a/content/browser/devtools/protocol/page_handler.h
+++ b/content/browser/devtools/protocol/page_handler.h
@@ -12,6 +12,7 @@
 #include "cc/output/compositor_frame_metadata.h"
 #include "content/browser/devtools/protocol/devtools_protocol_handler.h"
 #include "content/public/browser/readback_types.h"
+#include "third_party/WebKit/public/web/WebDeviceEmulationParams.h"
 
 class SkBitmap;
 
@@ -66,9 +67,18 @@ class PageHandler {
 
   Response CaptureScreenshot(DevToolsCommandId command_id);
 
-  Response CanScreencast(bool* result);
   Response CanEmulate(bool* result);
+  Response SetDeviceMetricsOverride(int width,
+                                    int height,
+                                    double device_scale_factor,
+                                    bool mobile,
+                                    bool fit_window,
+                                    const double* optional_scale,
+                                    const double* optional_offset_x,
+                                    const double* optional_offset_y);
+  Response ClearDeviceMetricsOverride();
 
+  Response CanScreencast(bool* result);
   Response StartScreencast(const std::string* format,
                            const int* quality,
                            const int* max_width,
@@ -89,6 +99,7 @@ class PageHandler {
 
  private:
   void UpdateTouchEventEmulationState();
+  void UpdateDeviceEmulationState();
 
   void NotifyScreencastVisibility(bool visible);
   void InnerSwapCompositorFrame();
@@ -110,9 +121,13 @@ class PageHandler {
       scoped_refptr<StopRecordingFramesResponse> response_data);
 
   bool enabled_;
+
   bool touch_emulation_enabled_;
   std::string touch_emulation_configuration_;
 
+  bool device_emulation_enabled_;
+  blink::WebDeviceEmulationParams device_emulation_params_;
+
   bool screencast_enabled_;
   std::string screencast_format_;
   int screencast_quality_;