Refactoring deferred bind logic

> Using ViewTreeObserver to listen for onDraw instead of overriding onDraw in workspace
> Loader passes the list of deferrerd runnables to launcher

Change-Id: Ie4877f746c96e9497396de8089f00f70bf867e17

src/com/android/launcher3/Workspace.java

@@ -278,13 +278,6 @@ public class Workspace extends PagedView
 
     private AccessibilityDelegate mPagesAccessibilityDelegate;
 
-    private final Runnable mBindPages = new Runnable() {
-        @Override
-        public void run() {
-            mLauncher.getModel().bindRemainingSynchronousPages();
-        }
-    };
-
     /**
      * Used to inflate the Workspace from XML.
      *
@@ -1718,14 +1711,6 @@ public class Workspace extends PagedView
         super.onLayout(changed, left, top, right, bottom);
     }
 
-    @Override
-    protected void onDraw(Canvas canvas) {
-        super.onDraw(canvas);
-
-        // Call back to LauncherModel to finish binding after the first draw
-        post(mBindPages);
-    }
-
     @Override
     protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
         if (!mLauncher.isAppsViewVisible()) {