VR: Remove bottom margin from NTP

Bug: 884803
Change-Id: I20378649418949c2d00097ff8ca204972c54b2ab
Reviewed-on: https://chromium-review.googlesource.com/1240169Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Aldo Culquicondor <acondor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595884}

chrome/android/java/src/org/chromium/chrome/browser/fullscreen/ChromeFullscreenManager.java

@@ -357,7 +357,7 @@ public class ChromeFullscreenManager
 
     @Override
     public int getBottomControlsHeight() {
-        return mBottomControlContainerHeight;
+        return VrModuleProvider.getDelegate().isInVr() ? 0 : mBottomControlContainerHeight;
     }
 
     /**

chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java

@@ -280,7 +280,7 @@ public class NewTabPageView extends FrameLayout {
 
         if (FeatureUtilities.isBottomToolbarEnabled()) {
             ((MarginLayoutParams) getLayoutParams()).bottomMargin =
-                    getResources().getDimensionPixelSize(R.dimen.bottom_toolbar_height);
+                    mTab.getFullscreenManager().getBottomControlsHeight();
         }
     }