Android: Fix cs width upon rotation

WebContents of contextual search panel can be created
after the device gets rotated. The content size to be
used for WebContents should have been updated to pick
up the right size after the rotation happens. This CL
fixes that.

Bug: 820940
Change-Id: I811d52db9d175adf100c0e13c0bfc35ac5d00d5a
Reviewed-on: https://chromium-review.googlesource.com/959408Reviewed-by: Donn Denman <donnd@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542991}

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanel.java

@@ -793,10 +793,16 @@ public class OverlayPanel extends OverlayPanelAnimation implements ActivityState
      */
     protected void resizePanelContentViewCore(float width, float height) {
         if (!isShowing()) return;
-        if (isFullWidthSizePanel()) height = height - getBarHeight();
-        getOverlayPanelContent().onSizeChanged((int) (width / mPxToDp), (int) (height / mPxToDp));
-        getOverlayPanelContent().onPhysicalBackingSizeChanged(
-                (int) (width / mPxToDp), (int) (height / mPxToDp));
+        OverlayPanelContent panelContent = getOverlayPanelContent();
+        int widthPx = (int) (width / mPxToDp);
+        int heightPx = (int) (height / mPxToDp);
+
+        // Device could have been rotated before panel webcontent creation. Update content size.
+        panelContent.setContentViewSize(widthPx, heightPx, isFullWidthSizePanel());
+
+        if (isFullWidthSizePanel()) heightPx = (int) ((height - getBarHeight()) / mPxToDp);
+        panelContent.onSizeChanged(widthPx, heightPx);
+        panelContent.onPhysicalBackingSizeChanged(widthPx, heightPx);
     }
 
     @Override