Provide WebVR pose data only to the focused frame.

chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
index 3da0388ae220df5b651d7c63d9f1d9ae65571c46..31881cddecb7e58ae21cc7b6d5bf7e5159b2be65 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
@@ -196,6 +196,7 @@ public class VrShellImpl extends GvrLayout implements VrShell, SurfaceHolder.Cal
         mOriginalWindowAndroid = mContentCVC.getWindowAndroid();
         mTab.updateWindowAndroid(mContentVrWindowAndroid);
         mContentCVC.onAttachedToWindow();
+        mContentCVC.getContainerView().requestFocus();
 
         // Make sure we are not redirecting to another app, i.e. out of VR mode.
         mNonVrTabRedirectHandler = mTab.getTabRedirectHandler();