Make code path for bounds changes getting to renderer less brittle

content/content_browser.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
     '../net/net.gyp:net',
@@ skipping 1165 matching lines @@
     'browser/utility_process_host_impl.cc',
     'browser/utility_process_host_impl.h',
     'browser/vibration/vibration_message_filter.cc',
     'browser/vibration/vibration_message_filter.h',
     'browser/vibration/vibration_provider_android.cc',
     'browser/vibration/vibration_provider_android.h',
     'browser/web_contents/aura/image_window_delegate.cc',
     'browser/web_contents/aura/image_window_delegate.h',
     'browser/web_contents/aura/shadow_layer_delegate.cc',
     'browser/web_contents/aura/shadow_layer_delegate.h',
+    'browser/web_contents/aura/constrained_windows_observer.cc',
+    'browser/web_contents/aura/constrained_windows_observer.h',
+    'browser/web_contents/aura/native_view_screen_bounds_observer.cc',
+    'browser/web_contents/aura/native_view_screen_bounds_observer.h',
     'browser/web_contents/aura/window_slider.cc',
     'browser/web_contents/aura/window_slider.h',
     'browser/web_contents/drag_utils_gtk.cc',
     'browser/web_contents/drag_utils_gtk.h',
     'browser/web_contents/touch_editable_impl_aura.cc',
     'browser/web_contents/touch_editable_impl_aura.h',
     'browser/web_contents/web_contents_drag_win.cc',
     'browser/web_contents/web_contents_drag_win.h',
     'browser/web_contents/web_contents_impl.cc',
     'browser/web_contents/web_contents_impl.h',
@@ skipping 207 matching lines @@
         'msvs_settings': {
           'VCLinkerTool': {
             'DelayLoadDLLs': [
               'dinput8.dll',
               'user32.dll',
               'dwmapi.dll',
             ],
           },
         },
       },
+    }, { # 'OS!="win"'
+      'sources/': [
+        ['exclude', 'browser/web_contents/aura/constrained_windows_observer.cc'],
+        ['exclude', 'browser/web_contents/aura/constrained_windows_observer.h'],
+      ],
     }],
     ['toolkit_uses_gtk == 1', {
       'dependencies': [
         # For FcLangSetAdd call in render_sandbox_host_linux.cc
         '../build/linux/system.gyp:fontconfig',
         '../build/linux/system.gyp:gtk',
         # For XShm* in backing_store_x.cc
         '../build/linux/system.gyp:x11',
       ],
     }],
@@ skipping 208 matching lines @@
         '../build/linux/system.gyp:dbus',
         '../dbus/dbus.gyp:dbus',
       ],
     }, {  # OS != "linux" or use_dbus==0
       'sources!': [
         'browser/geolocation/wifi_data_provider_linux.cc',
       ],
     }],
   ],
 }