DevTools: control touch emulation from the browser side only.

content/browser/devtools/renderer_overrides_handler.h

Index: content/browser/devtools/renderer_overrides_handler.h
diff --git a/content/browser/devtools/renderer_overrides_handler.h b/content/browser/devtools/renderer_overrides_handler.h
index 1dd366954e9bda3931518a620e193bd28779deb7..923d28d124beb6802767b30c618806b52e5ae2e2 100644
--- a/content/browser/devtools/renderer_overrides_handler.h
+++ b/content/browser/devtools/renderer_overrides_handler.h
@@ -46,7 +46,6 @@ class CONTENT_EXPORT RendererOverridesHandler
   void OnVisibilityChanged(bool visible);
   void SetRenderViewHost(RenderViewHostImpl* host);
   void ClearRenderViewHost();
-  bool OnSetTouchEventEmulationEnabled();
 
  private:
   void InnerSwapCompositorFrame();
@@ -75,6 +74,8 @@ class CONTENT_EXPORT RendererOverridesHandler
       scoped_refptr<DevToolsProtocol::Command> command);
   scoped_refptr<DevToolsProtocol::Response> PageNavigateToHistoryEntry(
       scoped_refptr<DevToolsProtocol::Command> command);
+  scoped_refptr<DevToolsProtocol::Response> PageSetTouchEmulationEnabled(
+      scoped_refptr<DevToolsProtocol::Command> command);
   scoped_refptr<DevToolsProtocol::Response> PageCaptureScreenshot(
       scoped_refptr<DevToolsProtocol::Command> command);
   scoped_refptr<DevToolsProtocol::Response> PageCanScreencast(
@@ -116,12 +117,15 @@ class CONTENT_EXPORT RendererOverridesHandler
   scoped_refptr<DevToolsProtocol::Response> InputEmulateTouchFromMouseEvent(
       scoped_refptr<DevToolsProtocol::Command> command);
 
+  void UpdateTouchEventEmulationState();
+
   RenderViewHostImpl* host_;
   scoped_refptr<DevToolsProtocol::Command> screencast_command_;
   bool has_last_compositor_frame_metadata_;
   cc::CompositorFrameMetadata last_compositor_frame_metadata_;
   base::TimeTicks last_frame_time_;
   int capture_retry_count_;
+  bool touch_emulation_enabled_;
   bool color_picker_enabled_;
   SkBitmap color_picker_frame_;
   int last_cursor_x_;