[Icons NTP] Refactor large_icon_source to extract the logic shared between desktop and Android to f…

chrome/browser/ui/webui/large_icon_source.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_LARGE_ICON_SOURCE_H_
 #define CHROME_BROWSER_UI_WEBUI_LARGE_ICON_SOURCE_H_
 
 #include <string>
-#include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "components/favicon/core/fallback_icon_service.h"
-#include "components/favicon_base/favicon_types.h"
 #include "content/public/browser/url_data_source.h"
-#include "third_party/skia/include/core/SkColor.h"
 
 namespace favicon {
 class FallbackIconService;
-class FaviconService;
+class LargeIconService;
+}
+
+namespace favicon_base {
+struct LargeIconResult;
 }
 
 // LargeIconSource services explicit chrome:// requests for large icons.
 //
 // Format:
 //   chrome://large-icon/size/url
 //
 // Parameter:
 //  'size'             Required (including trailing '/')
 //    Positive integer to specify the large icon's size in pixels.
 //  'url'              Optional
 //    String to specify the page URL of the large icon.
 //
 //  Example: chrome://large-icon/48/http://www.google.com/
 //    This requests a 48x48 large icon for http://www.google.com.
 class LargeIconSource : public content::URLDataSource {
  public:
-  // |favicon_service| and |fallback_icon_service| are owned by caller and may
-  // be null.
-  LargeIconSource(favicon::FaviconService* favicon_service,
-                  favicon::FallbackIconService* fallback_icon_service);
+  // |fallback_icon_service| and |large_icon_service| are owned by caller and
+  // may be null.
+  LargeIconSource(favicon::FallbackIconService* fallback_icon_service,
+                  favicon::LargeIconService* large_icon_service);
 
   ~LargeIconSource() override;
 
   // content::URLDataSource implementation.
   std::string GetSource() const override;
   void StartDataRequest(
       const std::string& path,
       int render_process_id,
       int render_frame_id,
       const content::URLDataSource::GotDataCallback& callback) override;
   std::string GetMimeType(const std::string&) const override;
   bool ShouldReplaceExistingSource() const override;
   bool ShouldServiceRequest(const net::URLRequest* request) const override;
 
- protected:
-  struct IconRequest {
-    IconRequest();
-    IconRequest(const content::URLDataSource::GotDataCallback& callback_in,
-                const GURL& path_in,
-                int size_in);
-    ~IconRequest();
-
-    content::URLDataSource::GotDataCallback callback;
-    GURL url;
-    int size;
-  };
-
  private:
-  // Callback for icon data retrieval request.
-  void OnIconDataAvailable(
-      const IconRequest& request,
-      const favicon_base::FaviconRawBitmapResult& bitmap_result);
-
-  // Renders and sends a default fallback icon. This is used when there is no
-  // known text and/or foreground color to use for the generated icon (it
-  // defaults to a light text color on a dark gray background).
-  void SendDefaultFallbackIcon(const IconRequest& request);
-
-  // Renders and sends a fallback icon using the given colors.
-  void SendFallbackIcon(const IconRequest& request,
-                        SkColor text_color,
-                        SkColor background_color);
+  // Called with results of large icon retrieval request.
+  void OnLargeIconDataAvailable(
+      const content::URLDataSource::GotDataCallback& callback,
+      const GURL& url,
+      int size,
+      const favicon_base::LargeIconResult& bitmap_result);
 
   // Returns null to trigger "Not Found" response.
   void SendNotFoundResponse(
       const content::URLDataSource::GotDataCallback& callback);
 
   base::CancelableTaskTracker cancelable_task_tracker_;
 
-  favicon::FaviconService* favicon_service_;
-
+  // Owned by client.
   favicon::FallbackIconService* fallback_icon_service_;
 
-  // A pre-populated list of the types of icon files to consider when looking
-  // for the largest matching icon.
-  // Note: this is simply an optimization over populating an icon type vector
-  //     on each request.
-  std::vector<int> large_icon_types_;
+  // Owned by client.
+  favicon::LargeIconService* large_icon_service_;
 
   DISALLOW_COPY_AND_ASSIGN(LargeIconSource);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_LARGE_ICON_SOURCE_H_