Ash: Support "Next Song", "Previous Song", "Play/Pause" Multi Media buttons

ash/accelerators/accelerator_controller.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 "ash/accelerators/accelerator_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <string>
 
@@ skipping 223 matching lines @@
       std::floor(std::log(scale) / std::log(kMagnificationFactor) + 0.5);
 
   int new_scale_index = std::max(0, std::min(8, scale_index + delta_index));
 
   ash::Shell::GetInstance()->magnification_controller()->
       SetScale(std::pow(kMagnificationFactor, new_scale_index), true);
 
   return true;
 }
 
+bool HandleMediaNextTrack() {
+  Shell::GetInstance()->delegate()->HandleMediaNextTrack();
+  return true;
+}
+
+bool HandleMediaPlayPause() {
+  Shell::GetInstance()->delegate()->HandleMediaPlayPause();
+  return true;
+}
+
+bool HandleMediaPrevTrack() {
+  Shell::GetInstance()->delegate()->HandleMediaPrevTrack();
+  return true;
+}
+
 #if !defined(NDEBUG)
 bool HandlePrintLayerHierarchy() {
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
   for (size_t i = 0; i < root_windows.size(); ++i) {
     ui::PrintLayerHierarchy(root_windows[i]->layer(),
                             root_windows[i]->GetLastMouseLocationInRoot());
   }
   return true;
 }
 
@@ skipping 397 matching lines @@
     case DISPLAY_CYCLE:
       internal::MultiDisplayManager::CycleDisplay();
       return true;
     case DISPLAY_TOGGLE_SCALE:
       internal::MultiDisplayManager::ToggleDisplayScale();
       return true;
     case MAGNIFY_SCREEN_ZOOM_IN:
       return HandleMagnifyScreen(1);
     case MAGNIFY_SCREEN_ZOOM_OUT:
       return HandleMagnifyScreen(-1);
+    case MEDIA_NEXT_TRACK:
+      return HandleMediaNextTrack();
+    case MEDIA_PLAY_PAUSE:
+       return HandleMediaPlayPause();
+    case MEDIA_PREV_TRACK:
+       return HandleMediaPrevTrack();
 #if !defined(NDEBUG)
     case PRINT_LAYER_HIERARCHY:
       return HandlePrintLayerHierarchy();
     case PRINT_VIEW_HIERARCHY:
       return HandlePrintViewHierarchy();
     case PRINT_WINDOW_HIERARCHY:
       return HandlePrintWindowHierarchy();
 #endif
     default:
       NOTREACHED() << "Unhandled action " << action;
@@ skipping 80 matching lines @@
     accelerators_.insert(
         std::make_pair(accelerator, accelerators[i].action));
   }
 }
 
 bool AcceleratorController::CanHandleAccelerators() const {
   return true;
 }
 
 }  // namespace ash