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

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 203ee4bf33b1a3fbbc2b38b4f240c3c975d79cbc..02c8e80a81da0421790f4410dfe64697927744f8 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1721,6 +1721,14 @@ void RenderViewImpl::printPage(WebLocalFrame* frame) {
                     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) {