Delete code involving overdraw bottom height.

chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorView.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorView.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorView.java
index 3d0f4d85436aacfd275d5e7eedb73d71ed1bae2c..6a22e52302a7318b1648bb34d3a1c2ac711068be 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorView.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorView.java
@@ -147,7 +147,6 @@ public class CompositorView
     @Override
     protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
         super.onLayout(changed, left, top, right, bottom);
-        mRenderHost.onOverdrawBottomHeightChanged(getOverdrawBottomHeight());
     }
 
     @Override
@@ -164,21 +163,6 @@ public class CompositorView
     }
 
     /**
-     * @return The amount the surface view is overdrawing the window bounds.
-     */
-    public int getOverdrawBottomHeight() {
-        if (mRootActivityView == null) {
-            mRootActivityView = mRootView.findViewById(android.R.id.content);
-        }
-        if (mRootActivityView != null) {
-            int compositorHeight = getHeight();
-            int rootViewHeight = mRootActivityView.getHeight();
-            return Math.max(0, compositorHeight - rootViewHeight);
-        }
-        return 0;
-    }
-
-    /**
      * Should be called for cleanup when the CompositorView instance is no longer used.
      */
     public void shutDown() {
@@ -412,11 +396,7 @@ public class CompositorView
         provider.getViewportPixel(mCacheViewport);
         nativeSetLayoutViewport(mNativeCompositorView, mCacheViewport.left, mCacheViewport.top,
                 mCacheViewport.width(), mCacheViewport.height(), mCacheVisibleViewport.left,
-                mCacheVisibleViewport.top, mRenderHost.getCurrentOverdrawBottomHeight(), 1.0f);
-
-        mCacheVisibleViewport.right = mCacheVisibleViewport.left + mSurfaceWidth;
-        mCacheVisibleViewport.bottom = mCacheVisibleViewport.top
-                + Math.max(mSurfaceHeight - mRenderHost.getCurrentOverdrawBottomHeight(), 0);
+                mCacheVisibleViewport.top, 1.0f);
 
         // TODO(changwan): move to treeprovider.
         updateToolbarLayer(provider, forRotation, progressBarDrawingInfo);
@@ -464,7 +444,7 @@ public class CompositorView
     private native void nativeSetNeedsComposite(long nativeCompositorView);
     private native void nativeSetLayoutViewport(long nativeCompositorView, float x, float y,
             float width, float height, float visibleXOffset, float visibleYOffset,
-            float overdrawBottomHeight, float dpToPixel);
+            float dpToPixel);
     private native void nativeUpdateToolbarLayer(long nativeCompositorView, int resourceId,
             int toolbarBackgroundColor, int urlBarResourceId, float urlBarAlpha, float topOffset,
             float brightness, boolean visible, boolean showShadow);