Implement "Save image as" for canvas (chromium side).

chrome/browser/renderer_context_menu/render_view_context_menu_browsertest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
@@ skipping 59 matching lines @@
                        OpenEntryAbsentForFilteredURLs) {
   scoped_ptr<TestRenderViewContextMenu> menu(
       CreateContextMenu(GURL("chrome://history"),
                         GURL()));
 
   ASSERT_FALSE(menu->IsItemPresent(IDC_CONTENT_CONTEXT_OPENLINKNEWTAB));
   ASSERT_FALSE(menu->IsItemPresent(IDC_CONTENT_CONTEXT_OPENLINKNEWWINDOW));
   ASSERT_TRUE(menu->IsItemPresent(IDC_CONTENT_CONTEXT_COPYLINKLOCATION));
 }
 
+IN_PROC_BROWSER_TEST_F(ContextMenuBrowserTest,
+                       SaveAsImageForCanvas) {
+  content::ContextMenuParams params;
+  params.media_type = blink::WebContextMenuData::MediaTypeCanvas;
+
+  TestRenderViewContextMenu menu(
+      browser()->tab_strip_model()->GetActiveWebContents()->GetMainFrame(),
+      params);
+  menu.Init();
+
+  ASSERT_TRUE(menu.IsItemPresent(IDC_CONTENT_CONTEXT_SAVEIMAGEAS));
+}
+
 // GTK requires a X11-level mouse event to open a context menu correctly.
 #if defined(TOOLKIT_GTK)
 #define MAYBE_RealMenu DISABLED_RealMenu
 #else
 #define MAYBE_RealMenu RealMenu
 #endif
 // Opens a link in a new tab via a "real" context menu.
 IN_PROC_BROWSER_TEST_F(ContextMenuBrowserTest,
                        MAYBE_RealMenu) {
   ContextMenuNotificationObserver menu_observer(
@@ skipping 129 matching lines @@
   // Verify that the referrer on the page matches |kEmptyReferrer|.
   std::string page_referrer;
   ASSERT_TRUE(content::ExecuteScriptAndExtractString(
       tab,
       "window.domAutomationController.send(window.document.referrer);",
       &page_referrer));
   ASSERT_EQ(kEmptyReferrer, page_referrer);
 }
 
 }  // namespace