[android_webview] Use a fraction to calculate scroll offset.

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 2805af26f729bf2fdf0bbfd2bafbe0f17055a99c..8feca760142eac59648ec39437e00019df5d72ed 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -360,12 +360,8 @@ public class AwContents {
     private class AwContentUpdateFrameInfoListener
                 implements ContentViewCore.UpdateFrameInfoListener {
         @Override
-        public void onFrameInfoUpdated(float widthCss, float heightCss, float pageScaleFactor) {
+        public void onFrameInfoUpdated(float pageScaleFactor) {
             if (mNativeAwContents == 0) return;
-            int widthPix = (int) Math.floor(widthCss * mDIPScale * pageScaleFactor);
-            int heightPix = (int) Math.floor(heightCss * mDIPScale * pageScaleFactor);
-            mScrollOffsetManager.setContentSize(widthPix, heightPix);
-
             nativeSetDisplayedPageScaleFactor(mNativeAwContents, pageScaleFactor);
         }
     }
@@ -1823,6 +1819,11 @@ public class AwContents {
     }
 
     @CalledByNative
+    private void setMaxContainerViewScrollOffset(int max_x, int max_y) {
+        mScrollOffsetManager.setMaxScrollOffset(max_x, max_y);
+    }
+
+    @CalledByNative
     private void scrollContainerViewTo(int x, int y) {
         mScrollOffsetManager.scrollContainerViewTo(x, y);
     }