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

components/test_runner/web_widget_test_client.h

Index: components/test_runner/web_widget_test_client.h
diff --git a/components/test_runner/web_widget_test_client.h b/components/test_runner/web_widget_test_client.h
index 209771260066fbe69af3a4215b471cf2ed6d0539..d766309d429679c39465f51ed0ef0bc51fcb489b 100644
--- a/components/test_runner/web_widget_test_client.h
+++ b/components/test_runner/web_widget_test_client.h
@@ -34,7 +34,7 @@ class WebWidgetTestClient : public blink::WebWidgetClient {
 
   virtual ~WebWidgetTestClient();
 
-  // WebWidgetClient overrides needed by WebViewTestProxy.
+  // WebWidgetClient overrides needed by WebWidgetTestProxy.
   blink::WebScreenInfo screenInfo() override;
   void scheduleAnimation() override;
   bool requestPointerLock() override;
@@ -43,6 +43,11 @@ class WebWidgetTestClient : public blink::WebWidgetClient {
   void setToolTipText(const blink::WebString& text,
                       blink::WebTextDirection direction) override;
   void resetInputMethod() override;
+  void startDragging(blink::WebReferrerPolicy policy,
+                     const blink::WebDragData& data,
+                     blink::WebDragOperationsMask mask,
+                     const blink::WebImage& image,
+                     const blink::WebPoint& point) override;
 
  private:
   void AnimateNow();