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

content/renderer/render_frame_impl.cc

 // Copyright 2013 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 "content/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 1505 matching lines @@
 void RenderFrameImpl::loadURLExternally(
     blink::WebLocalFrame* frame,
     const blink::WebURLRequest& request,
     blink::WebNavigationPolicy policy,
     const blink::WebString& suggested_name) {
   DCHECK(!frame_ || frame_ == frame);
   Referrer referrer(RenderViewImpl::GetReferrerFromRequest(frame, request));
   if (policy == blink::WebNavigationPolicyDownload) {
     render_view_->Send(new ViewHostMsg_DownloadUrl(render_view_->GetRoutingID(),
                                                    request.url(), referrer,
-                                                   suggested_name));
+                                                   suggested_name, false));
+  } else if (policy == blink::WebNavigationPolicyDownloadTo) {
+    render_view_->Send(new ViewHostMsg_DownloadUrl(render_view_->GetRoutingID(),
+                                                   request.url(), referrer,
+                                                   suggested_name, true));
   } else {
     OpenURL(frame, request.url(), referrer, policy);
   }
 }
 
 blink::WebNavigationPolicy RenderFrameImpl::decidePolicyForNavigation(
     blink::WebLocalFrame* frame,
     blink::WebDataSource::ExtraData* extra_data,
     const blink::WebURLRequest& request,
     blink::WebNavigationType type,
@@ skipping 1644 matching lines @@
     selection_text_offset_ = offset;
     selection_range_ = range;
     // This IPC is dispatched by RenderWidetHost, so use its routing ID.
     Send(new ViewHostMsg_SelectionChanged(
         GetRenderWidget()->routing_id(), text, offset, range));
   }
   GetRenderWidget()->UpdateSelectionBounds();
 }
 
 }  // namespace content