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

content/browser/renderer_host/render_message_filter.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/browser/renderer_host/render_message_filter.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 874 matching lines @@
   }
   if (enabled)
     return;
   *profile = g_color_profile.Get().profile();
 }
 #endif
 
 void RenderMessageFilter::OnDownloadUrl(const IPC::Message& message,
                                         const GURL& url,
                                         const Referrer& referrer,
-                                        const base::string16& suggested_name) {
+                                        const base::string16& suggested_name,
+                                        const bool use_prompt) {
   scoped_ptr<DownloadSaveInfo> save_info(new DownloadSaveInfo());
   save_info->suggested_name = suggested_name;
+  save_info->prompt_for_save_location = use_prompt;
 
   // There may be a special cookie store that we could use for this download,
   // rather than the default one. Since this feature is generally only used for
   // proper render views, and not downloads, we do not need to retrieve the
   // special cookie store here, but just initialize the request to use the
   // default cookie store.
   // TODO(tburkard): retrieve the appropriate special cookie store, if this
   // is ever to be used for downloads as well.
   scoped_ptr<net::URLRequest> request(
       resource_context_->GetRequestContext()->CreateRequest(
@@ skipping 427 matching lines @@
   }
 
   // Fallback to fake GpuMemoryBuffer that is backed by shared memory and
   // requires an upload before it can be used as a texture.
   handle->type = gfx::SHARED_MEMORY_BUFFER;
   ChildProcessHostImpl::AllocateSharedMemory(
       static_cast<size_t>(buffer_size), PeerHandle(), &handle->handle);
 }
 
 }  // namespace content