Update avatar button to MD

chrome/browser/ui/views/frame/glass_browser_frame_view.h

Index: chrome/browser/ui/views/frame/glass_browser_frame_view.h
diff --git a/chrome/browser/ui/views/frame/glass_browser_frame_view.h b/chrome/browser/ui/views/frame/glass_browser_frame_view.h
index 8b0ad07cd6475aa4dbbeb5512a5421fd3060b860..0a94580de11b220cf90e5c509436774652229a09 100644
--- a/chrome/browser/ui/views/frame/glass_browser_frame_view.h
+++ b/chrome/browser/ui/views/frame/glass_browser_frame_view.h
@@ -13,6 +13,8 @@
 #include "chrome/browser/ui/views/frame/windows_10_caption_button.h"
 #include "chrome/browser/ui/views/tab_icon_view.h"
 #include "chrome/browser/ui/views/tab_icon_view_model.h"
+#include "chrome/browser/ui/views/tabs/tab_strip.h"
+#include "chrome/browser/ui/views/tabs/tab_strip_observer.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/window/non_client_view.h"
 
@@ -20,7 +22,8 @@ class BrowserView;
 
 class GlassBrowserFrameView : public BrowserNonClientFrameView,
                               public views::ButtonListener,
-                              public TabIconViewModel {
+                              public TabIconViewModel,
+                              public TabStripObserver {
  public:
   // Constructs a non-client view for an BrowserFrame.
   GlassBrowserFrameView(BrowserFrame* frame, BrowserView* browser_view);
@@ -32,7 +35,8 @@ class GlassBrowserFrameView : public BrowserNonClientFrameView,
   int GetThemeBackgroundXInset() const override;
   void UpdateThrobber(bool running) override;
   gfx::Size GetMinimumSize() const override;
-  views::View* GetProfileSwitcherView() const override;
+  views::MenuButton* GetProfileSwitcherButton() const override;
+  void OnBrowserViewInitViewsComplete() override;
 
   // views::NonClientFrameView:
   gfx::Rect GetBoundsForClientView() const override;
@@ -73,6 +77,11 @@ class GlassBrowserFrameView : public BrowserNonClientFrameView,
   bool DoesIntersectRect(const views::View* target,
                          const gfx::Rect& rect) const override;
 
+  // TabStripObserver:
+  void TabStripMaxXChanged(TabStrip* tab_strip) override;
+  void TabStripDeleted(TabStrip* tab_strip) override;
+  void TabStripRemovedTabAt(TabStrip* tab_strip, int index) override;
+
   // Returns the thickness of the border around the client area (web content,
   // toolbar, and tabs) that separates it from the frame border. If |restored|
   // is true, this is calculated as if the window was restored, regardless of
@@ -189,6 +198,9 @@ class GlassBrowserFrameView : public BrowserNonClientFrameView,
   // The index of the current frame of the throbber animation.
   int throbber_frame_;
 
+  // TabStrip, which we need to watch for changes to resize the avatar button

[msarda, 2017/04/21 09:43:28]

It is not clear what "we" means in this context:
* is it the developper?
* is it this class?

Please rephrase. Maybe something like: 
// The tab strip, which needs to be observed for changes in order to resize the
avatar button.

[emx, 2017/04/24 16:23:10]

Done.

+  TabStrip* tab_strip_;
+
   static const int kThrobberIconCount = 24;
   static HICON throbber_icons_[kThrobberIconCount];
   static void InitThrobberIcons();