Fix a crash when saving a <canvas> or <img> image which is large.

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 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_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 1703 matching lines @@
 WebStorageNamespace* RenderViewImpl::createSessionStorageNamespace() {
   CHECK(session_storage_namespace_id_ != kInvalidSessionStorageNamespaceId);
   return new WebStorageNamespaceImpl(session_storage_namespace_id_);
 }
 
 void RenderViewImpl::printPage(WebLocalFrame* frame) {
   FOR_EACH_OBSERVER(RenderViewObserver, observers_,
                     PrintPage(frame, handling_input_event_));
 }
 
+void RenderViewImpl::saveImageFromDataURL(const blink::WebString& data_url) {
+  // Note: We should basically send GURL but we use size-limited string instead
+  // in order to send a larger data url to save a image for <canvas> or <img>.
+  const int MAX_LENGTH_OF_DATA_URL = 1024 * 1024 * 10;

[palmer, 2014/09/02 17:58:04]

Yeah, define this in 1 canonical place. The 2 declarations could drift over time
and become out of sync.

+  if (data_url.length() < MAX_LENGTH_OF_DATA_URL)
+    Send(new ViewHostMsg_SaveImageFromDataURL(routing_id_, data_url.utf8()));
+}
+
 bool RenderViewImpl::enumerateChosenDirectory(
     const WebString& path,
     WebFileChooserCompletion* chooser_completion) {
   int id = enumeration_completion_id_++;
   enumeration_completions_[id] = chooser_completion;
   return Send(new ViewHostMsg_EnumerateDirectory(
       routing_id_,
       id,
       base::FilePath::FromUTF16Unsafe(path)));
 }
@@ skipping 2466 matching lines @@
     std::vector<gfx::Size> sizes;
     ConvertToFaviconSizes(icon_urls[i].sizes(), &sizes);
     if (!url.isEmpty())
       urls.push_back(
           FaviconURL(url, ToFaviconType(icon_urls[i].iconType()), sizes));
   }
   SendUpdateFaviconURL(urls);
 }
 
 }  // namespace content