Drag-and-drop: Move startDrag out of WebView/RenderView.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 5bde3b184419e453b372dd7994374c0d46c9717c..c36cd199c8b811df70055031429fcc83f46f688a 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -22,6 +22,7 @@
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/common/cursors/webcursor.h"
+#include "content/common/drag_event_source_info.h"
 #include "content/common/edit_command.h"
 #include "content/common/input/synthetic_gesture_params.h"
 #include "content/public/common/screen_info.h"
@@ -65,8 +66,10 @@ namespace scheduler {
 class RenderWidgetSchedulingState;
 }
 struct WebDeviceEmulationParams;
+class WebDragData;
 class WebFrameWidget;
 class WebGestureEvent;
+class WebImage;
 class WebLocalFrame;
 class WebMouseEvent;
 class WebNode;
@@ -287,6 +290,11 @@ class CONTENT_EXPORT RenderWidget
   bool requestPointerLock() override;
   void requestPointerUnlock() override;
   bool isPointerLocked() override;
+  void startDragging(blink::WebLocalFrame* frame,
+                     const blink::WebDragData& data,
+                     blink::WebDragOperationsMask mask,
+                     const blink::WebImage& image,
+                     const blink::WebPoint& imageOffset) override;
 
   // Override point to obtain that the current input method state and caret
   // position.
@@ -392,6 +400,12 @@ class CONTENT_EXPORT RenderWidget
     focused_pepper_plugin_ = plugin;
   }
 
+  void set_possible_drag_event_info(ui::DragDropTypes::DragEventSource source,
+                                    gfx::Point location) {
+    possible_drag_event_info_.event_source = source;
+    possible_drag_event_info_.event_location = location;
+  }
+
   // When emulated, this returns original device scale factor.
   float GetOriginalDeviceScaleFactor() const;
 
@@ -821,6 +835,11 @@ class CONTENT_EXPORT RenderWidget
   // Will be cleared as soon as the next key event is processed.
   EditCommands edit_commands_;
 
+  // This field stores drag/drop related info for the event that is currently
+  // being handled. If the current event results in starting a drag/drop
+  // session, this info is sent to the browser along with other drag/drop info.
+  DragEventSourceInfo possible_drag_event_info_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };