[android_webview] Use a fraction to calculate scroll offset.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 88785c177e4d7083df2badb0f07f756141072d1b..1ac3e5c26bfe2d53787016ad32768e992a37b9ef 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -244,11 +244,9 @@ import java.util.Map;
         /**
          * Called each time any of the parameters are changed.
          *
-         * @param widthCss The content width in logical (CSS) pixels.
-         * @param heightCss The content height in logical (CSS) pixels.
          * @param pageScaleFactor The page scale.
          */
-        void onFrameInfoUpdated(float widthCss, float heightCss, float pageScaleFactor);
+        void onFrameInfoUpdated(float pageScaleFactor);
     }
 
     private VSyncManager.Provider mVSyncProvider;
@@ -359,7 +357,6 @@ import java.util.Map;
 
     private ContentViewGestureHandler mContentViewGestureHandler;
     private GestureStateListener mGestureStateListener;
-    private UpdateFrameInfoListener mUpdateFrameInfoListener;
     private ZoomManager mZoomManager;
     private ZoomControlsDelegate mZoomControlsDelegate;
 
@@ -2337,10 +2334,6 @@ import java.util.Map;
         if (mNativeContentViewCore != 0) nativeShowImeIfNeeded(mNativeContentViewCore);
     }
 
-    public void setUpdateFrameInfoListener(UpdateFrameInfoListener updateFrameInfoListener) {
-        mUpdateFrameInfoListener = updateFrameInfoListener;
-    }
-
     @SuppressWarnings("unused")
     @CalledByNative
     private void updateFrameInfo(
@@ -2396,11 +2389,6 @@ import java.util.Map;
                 pageScaleFactor, minPageScaleFactor, maxPageScaleFactor,
                 contentOffsetYPix);
 
-        if ((contentSizeChanged || pageScaleChanged) && mUpdateFrameInfoListener != null) {
-            mUpdateFrameInfoListener.onFrameInfoUpdated(
-                    contentWidth, contentHeight, pageScaleFactor);
-        }
-
         if (needTemporarilyHideHandles) temporarilyHideTextHandles();
         if (needUpdateZoomControls) mZoomControlsDelegate.updateZoomControls();
         if (contentOffsetChanged) updateHandleScreenPositions();