Reland: Allow high-res bitmaps to be passed in from notifications API.

chrome/renderer/extensions/notifications_native_handler.h

+// Copyright 2014 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_RENDERER_EXTENSIONS_NOTIFICATIONS_NATIVE_HANDLER_H_
+#define CHROME_RENDERER_EXTENSIONS_NOTIFICATIONS_NATIVE_HANDLER_H_
+
+#include "base/compiler_specific.h"
+#include "extensions/renderer/object_backed_native_handler.h"
+
+namespace base {
+class Value;
+}
+
+namespace extensions {
+
+class NotificationsNativeHandler : public ObjectBackedNativeHandler {
+ public:
+  explicit NotificationsNativeHandler(ScriptContext* context);
+
+ private:
+  // This implements notifications_private.GetImageSizes() which
+  // informs the renderer of the actual rendered size of each
+  // component of a notification.  It additionally includes
+  // information about the system's maximum scale factor so that
+  // larger images specified in DP can be interpreted as scaled
+  // versions of the DIP size.
+  //   * |args| is used only to get the return value.
+  //   * The return value contains the following keys:
+  //         scaleFactor - a float a la devicePixelRatio
+  //         icon - a dictionary with integer keys "height" and "width" (DIPs)
+  //         image - a dictionary of the same format as |icon|
+  //         buttonIcon - a dictionary of the same format as |icon|
+  void GetNotificationImageSizes(
+      const v8::FunctionCallbackInfo<v8::Value>& args);
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationsNativeHandler);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_RENDERER_EXTENSIONS_NOTIFICATIONS_NATIVE_HANDLER_H_