Add ViewObserver to View for view updates

ui/views/view.cc

Index: ui/views/view.cc
diff --git a/ui/views/view.cc b/ui/views/view.cc
index b6cd9d0e97f9345128f754a62f0b80e15fa2430f..ef57d1d0ae5a3065cabb398a2190062c8ec9ed82 100644
--- a/ui/views/view.cc
+++ b/ui/views/view.cc
@@ -48,6 +48,7 @@
 #include "ui/views/background.h"
 #include "ui/views/border.h"
 #include "ui/views/context_menu_controller.h"
+#include "ui/views/devtools_observer.h"
 #include "ui/views/drag_controller.h"
 #include "ui/views/focus/view_storage.h"
 #include "ui/views/layout/layout_manager.h"
@@ -118,7 +119,8 @@ View::View()
       focus_behavior_(FocusBehavior::NEVER),
       context_menu_controller_(NULL),
       drag_controller_(NULL),
-      native_view_accessibility_(NULL) {
+      native_view_accessibility_(NULL),
+      devtools_observer_(nullptr) {
   SetTargetHandler(this);
 }
 
@@ -243,6 +245,9 @@ void View::ReorderChildView(View* view, int index) {
   if (next_focusable)
     next_focusable->previous_focusable_view_ = prev_focusable;
 
+  if (devtools_observer_)
+    devtools_observer_->OnChildViewReordered(view, index);
+
   // Add it in the specified index now.
   InitFocusSiblings(view, index);
   children_.insert(children_.begin() + index, view);
@@ -295,6 +300,9 @@ void View::SetBoundsRect(const gfx::Rect& bounds) {
         SCHEDULE_PAINT_SIZE_CHANGED);
   }
 
+  if (devtools_observer_)
+    devtools_observer_->OnViewBoundsChanged(this, bounds);
+
   gfx::Rect prev = bounds_;
   bounds_ = bounds;
   BoundsChanged(prev);
@@ -436,6 +444,8 @@ void View::SetEnabled(bool enabled) {
   if (enabled != enabled_) {
     enabled_ = enabled;
     AdvanceFocusIfNecessary();
+    if (devtools_observer_)
+      devtools_observer_->OnViewEnabledChanged(this, enabled);
     OnEnabledChanged();
   }
 }
@@ -1878,6 +1888,8 @@ void View::ViewHierarchyChangedImpl(
     }
   }
 
+  if (devtools_observer_)
+    devtools_observer_->OnViewHierarchyChanged(this, details);
   ViewHierarchyChanged(details);
   details.parent->needs_layout_ = true;
 }
@@ -1897,6 +1909,8 @@ void View::PropagateVisibilityNotifications(View* start, bool is_visible) {
 }
 
 void View::VisibilityChangedImpl(View* starting_from, bool is_visible) {
+  if (devtools_observer_)
+    devtools_observer_->OnViewVisibilityChanged(starting_from, is_visible);
   VisibilityChanged(starting_from, is_visible);
 }