Implement "Copy image" for canvas (chromium side).

chrome/browser/renderer_context_menu/render_view_context_menu.cc

Index: chrome/browser/renderer_context_menu/render_view_context_menu.cc
diff --git a/chrome/browser/renderer_context_menu/render_view_context_menu.cc b/chrome/browser/renderer_context_menu/render_view_context_menu.cc
index 7d928d82562c423dfb3351be010eabaf3e5e810a..9c9a629bad1122a397f0d8a21a4fd841adfaedde 100644
--- a/chrome/browser/renderer_context_menu/render_view_context_menu.cc
+++ b/chrome/browser/renderer_context_menu/render_view_context_menu.cc
@@ -853,9 +853,8 @@ void RenderViewContextMenu::AppendAudioItems() {
 void RenderViewContextMenu::AppendCanvasItems() {
   menu_model_.AddItemWithStringId(IDC_CONTENT_CONTEXT_SAVEIMAGEAS,
                                   IDS_CONTENT_CONTEXT_SAVEIMAGEAS);
-
-  // TODO(zino): We should support 'copy image' for canvas.
-  // http://crbug.com/369092
+  menu_model_.AddItemWithStringId(IDC_CONTENT_CONTEXT_COPYIMAGE,
+                                  IDS_CONTENT_CONTEXT_COPYIMAGE);
 }
 
 void RenderViewContextMenu::AppendVideoItems() {