Extract renderer-side favicon downloading code into separate helper class

chrome/renderer/chrome_render_view_observer.cc

Index: chrome/renderer/chrome_render_view_observer.cc
diff --git a/chrome/renderer/chrome_render_view_observer.cc b/chrome/renderer/chrome_render_view_observer.cc
index 3521944bf122cbaf93729e5d09bac85fdf90e980..45a21adce0d4c78e54292156b3b952c0c0fbc5a3 100644
--- a/chrome/renderer/chrome_render_view_observer.cc
+++ b/chrome/renderer/chrome_render_view_observer.cc
@@ -13,7 +13,7 @@
 #include "base/string_util.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
-#include "chrome/common/icon_messages.h"
+#include "chrome/common/favicon_url.h"
 #include "chrome/common/prerender_messages.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
@@ -22,6 +22,7 @@
 #include "chrome/renderer/extensions/dispatcher.h"
 #include "chrome/renderer/extensions/extension_helper.h"
 #include "chrome/renderer/external_host_bindings.h"
+#include "chrome/renderer/favicon_helper.h"
 #include "chrome/renderer/frame_sniffer.h"
 #include "chrome/renderer/prerender/prerender_helper.h"
 #include "chrome/renderer/safe_browsing/phishing_classifier_delegate.h"
@@ -200,13 +201,15 @@ ChromeRenderViewObserver::ChromeRenderViewObserver(
     ContentSettingsObserver* content_settings,
     ChromeRenderProcessObserver* chrome_render_process_observer,
     extensions::Dispatcher* extension_dispatcher,
-    TranslateHelper* translate_helper)
+    TranslateHelper* translate_helper,
+    FaviconHelper* favicon_helper)
     : content::RenderViewObserver(render_view),
       chrome_render_process_observer_(chrome_render_process_observer),
       extension_dispatcher_(extension_dispatcher),
       content_settings_(content_settings),
       translate_helper_(translate_helper),
       phishing_classifier_(NULL),
+      favicon_helper_(favicon_helper),
       last_indexed_page_id_(-1),
       allow_displaying_insecure_content_(false),
       allow_running_insecure_content_(false),
@@ -229,7 +232,6 @@ bool ChromeRenderViewObserver::OnMessageReceived(const IPC::Message& message) {
                         OnHandleMessageFromExternalHost)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_JavaScriptStressTestControl,
                         OnJavaScriptStressTestControl)
-    IPC_MESSAGE_HANDLER(IconMsg_DownloadFavicon, OnDownloadFavicon)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetAllowDisplayingInsecureContent,
                         OnSetAllowDisplayingInsecureContent)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetAllowRunningInsecureContent,
@@ -304,28 +306,6 @@ void ChromeRenderViewObserver::OnJavaScriptStressTestControl(int cmd,
   }
 }
 
-void ChromeRenderViewObserver::OnDownloadFavicon(int id,
-                                                 const GURL& image_url,
-                                                 int image_size) {
-  bool data_image_failed = false;
-  if (image_url.SchemeIs("data")) {
-    SkBitmap data_image = ImageFromDataUrl(image_url);
-    data_image_failed = data_image.empty();
-    if (!data_image_failed) {
-      std::vector<SkBitmap> images(1, data_image);
-      Send(new IconHostMsg_DidDownloadFavicon(
-          routing_id(), id, image_url, false, image_size, images));
-    }
-  }
-
-  if (data_image_failed ||
-      !DownloadFavicon(id, image_url, image_size)) {
-    Send(new IconHostMsg_DidDownloadFavicon(
-        routing_id(), id, image_url, true, image_size,
-        std::vector<SkBitmap>()));
-  }
-}
-
 void ChromeRenderViewObserver::OnSetAllowDisplayingInsecureContent(bool allow) {
   allow_displaying_insecure_content_ = allow;
   WebFrame* main_frame = render_view()->GetWebView()->mainFrame();
@@ -713,10 +693,8 @@ void ChromeRenderViewObserver::DidStopLoading() {
     if (!url.isEmpty())
       urls.push_back(FaviconURL(url, ToFaviconType(icon_urls[i].iconType())));
   }
-  if (!urls.empty()) {
-    Send(new IconHostMsg_UpdateFaviconURL(
-        routing_id(), render_view()->GetPageId(), urls));
-  }
+  favicon_helper_->SendUpdateFaviconURL(
+      routing_id(), render_view()->GetPageId(), urls);
 }
 
 void ChromeRenderViewObserver::DidChangeIcon(WebFrame* frame,
@@ -734,8 +712,8 @@ void ChromeRenderViewObserver::DidChangeIcon(WebFrame* frame,
     urls.push_back(FaviconURL(icon_urls[i].iconURL(),
                               ToFaviconType(icon_urls[i].iconType())));
   }
-  Send(new IconHostMsg_UpdateFaviconURL(
-      routing_id(), render_view()->GetPageId(), urls));
+  favicon_helper_->SendUpdateFaviconURL(
+      routing_id(), render_view()->GetPageId(), urls);
 }
 
 void ChromeRenderViewObserver::DidCommitProvisionalLoad(
@@ -931,61 +909,6 @@ ExternalHostBindings* ChromeRenderViewObserver::GetExternalHostBindings() {
   return external_host_bindings_.get();
 }
 
-bool ChromeRenderViewObserver::DownloadFavicon(int id,
-                                               const GURL& image_url,
-                                               int image_size) {
-  // Make sure webview was not shut down.
-  if (!render_view()->GetWebView())
-    return false;
-  // Create an image resource fetcher and assign it with a call back object.
-  image_fetchers_.push_back(linked_ptr<MultiResolutionImageResourceFetcher>(
-      new MultiResolutionImageResourceFetcher(
-          image_url, render_view()->GetWebView()->mainFrame(), id,
-          WebURLRequest::TargetIsFavicon,
-          base::Bind(&ChromeRenderViewObserver::DidDownloadFavicon,
-                     base::Unretained(this), image_size))));
-  return true;
-}
-
-void ChromeRenderViewObserver::DidDownloadFavicon(
-    int requested_size,
-    MultiResolutionImageResourceFetcher* fetcher,
-    const std::vector<SkBitmap>& images) {
-  // Notify requester of image download status.
-  Send(new IconHostMsg_DidDownloadFavicon(routing_id(),
-                                          fetcher->id(),
-                                          fetcher->image_url(),
-                                          images.empty(),
-                                          requested_size,
-                                          images));
-
-  // Remove the image fetcher from our pending list. We're in the callback from
-  // MultiResolutionImageResourceFetcher, best to delay deletion.
-  ImageResourceFetcherList::iterator iter;
-  for (iter = image_fetchers_.begin(); iter != image_fetchers_.end(); ++iter) {
-    if (iter->get() == fetcher) {
-      iter->release();
-      image_fetchers_.erase(iter);
-      break;
-    }
-  }
-  MessageLoop::current()->DeleteSoon(FROM_HERE, fetcher);
-}
-
-SkBitmap ChromeRenderViewObserver::ImageFromDataUrl(const GURL& url) const {
-  std::string mime_type, char_set, data;
-  if (net::DataURL::Parse(url, &mime_type, &char_set, &data) && !data.empty()) {
-    // Decode the favicon using WebKit's image decoder.
-    webkit_glue::ImageDecoder decoder(
-        gfx::Size(gfx::kFaviconSize, gfx::kFaviconSize));
-    const unsigned char* src_data =
-        reinterpret_cast<const unsigned char*>(&data[0]);
-
-    return decoder.Decode(src_data, data.size());
-  }
-  return SkBitmap();
-}
-
 bool ChromeRenderViewObserver::IsStrictSecurityHost(const std::string& host) {
   return (strict_security_hosts_.find(host) != strict_security_hosts_.end());
 }