Refactor Vr activity into ChromeTabbedActivity.

chrome/android/java/strings/android_chrome_strings.grd

Index: chrome/android/java/strings/android_chrome_strings.grd
diff --git a/chrome/android/java/strings/android_chrome_strings.grd b/chrome/android/java/strings/android_chrome_strings.grd
index f413f283fc099f9a73abdc4d7ed208092ccea1bf..743e8b1fb67cd01c2e0c9293aa5d9fa5201f4656 100644
--- a/chrome/android/java/strings/android_chrome_strings.grd
+++ b/chrome/android/java/strings/android_chrome_strings.grd
@@ -226,6 +226,9 @@ CHAR-LIMIT guidelines:
       <message name="IDS_PREFS_SECTION_ADVANCED" desc='Title of "Advanced" section of preferences. [CHAR-LIMIT=32]'>
         Advanced
       </message>
+      <message name="IDS_ENTER_VR" desc="Menu item for entering VR. [CHAR-LIMIT=27]">
+        &#128083;&#128083;&#128083; Enter VR &#128083;&#128083;&#128083;

[Ted C, 2016/09/13 16:34:55]

Just synced and this is crashing when I attempt to open the menu on my KK phone.

W/dalvikvm( 9297): JNI WARNING: NewStringUTF input is not valid Modified UTF-8:
illegal start byte 0xf0
W/dalvikvm( 9297):              string: '👓👓👓 Enter VR 👓👓👓'
W/dalvikvm( 9297):              in
Landroid/content/res/StringBlock;.nativeGetString:(II)Ljava/lang/String;
(NewStringUTF)

I/dalvikvm( 9297):   at android.content.res.StringBlock.nativeGetString(Native
Method)
I/dalvikvm( 9297):   at android.content.res.StringBlock.get(StringBlock.java:82)
I/dalvikvm( 9297):   at
android.content.res.AssetManager.getPooledString(AssetManager.java:275)
I/dalvikvm( 9297):   at
android.content.res.TypedArray.loadStringValueAt(TypedArray.java:727)
I/dalvikvm( 9297):   at
android.content.res.TypedArray.getText(TypedArray.java:97)
I/dalvikvm( 9297):   at
android.view.MenuInflater$MenuState.readItem(MenuInflater.java:348)
I/dalvikvm( 9297):   at
android.view.MenuInflater.parseMenu(MenuInflater.java:160)
I/dalvikvm( 9297):   at android.view.MenuInflater.inflate(MenuInflater.java:110)
I/dalvikvm( 9297):   at android.widget.PopupMenu.inflate(PopupMenu.java:159)
I/dalvikvm( 9297):   at
org.chromium.chrome.browser.appmenu.AppMenuHandler.showAppMenu(AppMenuHandler.java:104)

[mthiesse, 2016/09/13 16:39:44]

https://codereview.chromium.org/2337103004/

+      </message>
 
       <!-- Sign-in preference -->
       <message name="IDS_SIGN_IN_TO_CHROME" desc="Title for the button to sign in to Chrome using one's Google account. [CHAR-LIMIT=27]">