[android_webview] Use a fraction to calculate scroll offset.

android_webview/native/aw_contents.cc

Index: android_webview/native/aw_contents.cc
diff --git a/android_webview/native/aw_contents.cc b/android_webview/native/aw_contents.cc
index ac2cba3456c2441bc6bb8d99685348bc309221c5..376490a56c44607fbb34c80102911ec1cab5a8fe 100644
--- a/android_webview/native/aw_contents.cc
+++ b/android_webview/native/aw_contents.cc
@@ -800,6 +800,15 @@ gfx::Point AwContents::GetLocationOnScreen() {
   return gfx::Point(location[0], location[1]);
 }
 
+void AwContents::SetMaxContainerViewScrollOffset(gfx::Vector2d new_value) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
+  if (obj.is_null())
+    return;
+  Java_AwContents_setMaxContainerViewScrollOffset(
+      env, obj.obj(), new_value.x(), new_value.y());
+}
+
 void AwContents::ScrollContainerViewTo(gfx::Vector2d new_value) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
@@ -809,7 +818,6 @@ void AwContents::ScrollContainerViewTo(gfx::Vector2d new_value) {
       env, obj.obj(), new_value.x(), new_value.y());
 }
 
-
 void AwContents::DidOverscroll(gfx::Vector2d overscroll_delta) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
@@ -836,8 +844,8 @@ void AwContents::SetFixedLayoutSize(JNIEnv* env,
   render_view_host_ext_->SetFixedLayoutSize(gfx::Size(width_dip, height_dip));
 }
 
-void AwContents::ScrollTo(JNIEnv* env, jobject obj, jint xPix, jint yPix) {
-  browser_view_renderer_->ScrollTo(gfx::Vector2d(xPix, yPix));
+void AwContents::ScrollTo(JNIEnv* env, jobject obj, jint x, jint y) {
+  browser_view_renderer_->ScrollTo(gfx::Vector2d(x, y));
 }
 
 void AwContents::OnWebLayoutPageScaleFactorChanged(float page_scale_factor) {