Tab audio mute control (views UI), behind a switch (off by default).

chrome/browser/ui/views/tabs/tab.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_
 
 #include <list>
 #include <string>
 
@@ skipping 129 matching lines @@
  private:
   friend class TabTest;
   FRIEND_TEST_ALL_PREFIXES(TabTest, CloseButtonLayout);
 
   friend class TabStripTest;
   FRIEND_TEST_ALL_PREFIXES(TabStripTest, TabHitTestMaskWhenStacked);
   FRIEND_TEST_ALL_PREFIXES(TabStripTest, ClippedTabCloseButton);
 
   // The animation object used to swap the favicon with the sad tab icon.
   class FaviconCrashAnimation;
+  class MediaIndicatorButton;
   class TabCloseButton;
 
   // Contains a cached image and the values used to generate it.
   struct ImageCacheEntry {
     ImageCacheEntry();
     ~ImageCacheEntry();
 
     // ID of the resource used.
     int resource_id;
 
@@ skipping 58 matching lines @@
   void PaintImmersiveTab(gfx::Canvas* canvas);
 
   // Paint various portions of the Tab
   void PaintTabBackground(gfx::Canvas* canvas);
   void PaintInactiveTabBackgroundWithTitleChange(gfx::Canvas* canvas);
   void PaintInactiveTabBackground(gfx::Canvas* canvas);
   void PaintInactiveTabBackgroundUsingResourceId(gfx::Canvas* canvas,
                                                  int tab_id);
   void PaintActiveTabBackground(gfx::Canvas* canvas);
 
-  // Paints the favicon and media indicator icon, mirrored for RTL if needed.
+  // Paints the favicon, mirrored for RTL if needed.
   void PaintIcon(gfx::Canvas* canvas);
-  void PaintMediaIndicator(gfx::Canvas* canvas);
 
   // Invoked if data_.network_state changes, or the network_state is not none.
   void AdvanceLoadingAnimation(TabRendererData::NetworkState old_state,
                                TabRendererData::NetworkState state);
 
   // Returns the number of favicon-size elements that can fit in the tab's
   // current size.
   int IconCapacity() const;
 
   // Returns whether the Tab should display a favicon.
@@ skipping 16 matching lines @@
 
   void DisplayCrashedFavicon();
   void ResetCrashedFavicon();
 
   void StopCrashAnimation();
   void StartCrashAnimation();
 
   // Returns true if the crash animation is currently running.
   bool IsPerformingCrashAnimation() const;
 
-  // Starts the media indicator fade-in/out animation. There's no stop method
-  // because this is not a continuous animation.
-  void StartMediaIndicatorAnimation();
-
   // Schedules repaint task for icon.
   void ScheduleIconPaint();
 
   // Returns the rectangle for the light bar in immersive mode.
   gfx::Rect GetImmersiveBarRect() const;
 
   // Gets the tab id and frame id.
   void GetTabIdAndFrameId(views::Widget* widget,
                           int* tab_id,
                           int* frame_id) const;
 
+  // Returns |media_indicator_button_|, creating it on-demand.
+  MediaIndicatorButton* LazyGetMediaIndicatorButton();

[sky, 2014/09/23 22:58:18]

Nuke the 'Lazy'. That is, make it GetMediaIndicatorButton().

[miu, 2014/09/24 22:34:16]

Done.

+
   // Performs a one-time initialization of static resources such as tab images.
   static void InitTabResources();
 
   // Returns the minimum possible size of a single unselected Tab, not
   // including considering touch mode.
   static gfx::Size GetBasicMinimumUnselectedSize();
 
   // Loads the images to be used for the tab background.
   static void LoadTabImages();
 
@@ skipping 36 matching lines @@
   bool should_display_crashed_favicon_;
 
   // Whole-tab throbbing "pulse" animation.
   scoped_ptr<gfx::ThrobAnimation> pulse_animation_;
 
   scoped_ptr<gfx::MultiAnimation> mini_title_change_animation_;
 
   // Crash icon animation (in place of favicon).
   scoped_ptr<gfx::LinearAnimation> crash_icon_animation_;
 
-  // Media indicator fade-in/out animation (i.e., only on show/hide, not a
-  // continuous animation).
-  scoped_ptr<gfx::Animation> media_indicator_animation_;
-  TabMediaState animating_media_state_;
-
   scoped_refptr<gfx::AnimationContainer> animation_container_;
 
   views::ImageButton* close_button_;
+  MediaIndicatorButton* media_indicator_button_;  // NULL until first use.
   views::Label* title_;
 
   bool tab_activated_with_last_tap_down_;
 
   views::GlowHoverController hover_controller_;
 
   // The bounds of various sections of the display.
   gfx::Rect favicon_bounds_;
-  gfx::Rect media_indicator_bounds_;
 
   // The offset used to paint the inactive background image.
   gfx::Point background_offset_;
 
   struct TabImage {
     gfx::ImageSkia* image_l;
     gfx::ImageSkia* image_c;
     gfx::ImageSkia* image_r;
     int l_width;
     int r_width;
@@ skipping 18 matching lines @@
   SkColor close_button_color_;
 
   // As the majority of the tabs are inactive, and painting tabs is slowish,
   // we cache a handful of the inactive tab backgrounds here.
   static ImageCache* image_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(Tab);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_