Fix context menu "Copy image" not working sometimes at hidpi.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 95b0c68645d2b1cc42c709b26d0a4ade3266dd92..c0d75756160dad7d71001b07ac2216026e80a14f 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1973,11 +1973,15 @@ void RenderFrameImpl::OnReplaceMisspelling(const base::string16& text) {
 }
 
 void RenderFrameImpl::OnCopyImageAt(int x, int y) {
-  frame_->copyImageAt(WebPoint(x, y));
+  blink::WebFloatRect viewport_position(x, y, 0, 0);
+  GetRenderWidget()->convertWindowToViewport(&viewport_position);
+  frame_->copyImageAt(WebPoint(viewport_position.x, viewport_position.y));
 }
 
 void RenderFrameImpl::OnSaveImageAt(int x, int y) {
-  frame_->saveImageAt(WebPoint(x, y));
+  blink::WebFloatRect viewport_position(x, y, 0, 0);
+  GetRenderWidget()->convertWindowToViewport(&viewport_position);
+  frame_->saveImageAt(WebPoint(viewport_position.x, viewport_position.y));
 }
 
 void RenderFrameImpl::OnAddMessageToConsole(ConsoleMessageLevel level,