weblayer: Set top control offset on init

When TopControlContainerView is destroyed and recreated on when weblayer
fragment is retained across activities, there is a mismatch between the
content offset in native code and the new top controls, causing a
mismatch that leads to touch events being offset incorrectly until new
scroll causes a sync again.

Set content offset on init, which also sets it on re-init that fixes
this bug.

Bug: 1057625
Change-Id: I477e2efb648028c0204091a33f16d17e61248efc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2081841Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746473}

weblayer/browser/java/org/chromium/weblayer_private/TopControlsContainerView.java

@@ -265,6 +265,7 @@ class TopControlsContainerView extends FrameLayout {
         mLastHeight = getHeight();
         TopControlsContainerViewJni.get().setTopControlsSize(mNativeTopControlsContainerView,
                 TopControlsContainerView.this, mLastWidth, mLastHeight);
+        setTopControlsOffset(0, mLastHeight);
     }
 
     private void finishTopControlsScroll(int topContentOffsetY) {