Add camera affordance to navigation bar on phones

This adds a camera button on phones that can be used to show
and launch the camera.

- Minor refactoring of touch event dispatch in PagedView.
- Disables usability hints when keyguard loads.
- Only add a touch handler for camera icon once during layout.
- Update after review.
- Updated with latest UX camera and camera background assets

Change-Id: I09cd5cb0e501fd0f4659bea96d00c92b07f805c4
diff --git a/packages/SystemUI/AndroidManifest.xml b/packages/SystemUI/AndroidManifest.xml
index fa5c769..fb73d39 100644
--- a/packages/SystemUI/AndroidManifest.xml
+++ b/packages/SystemUI/AndroidManifest.xml
@@ -52,7 +52,7 @@
     <uses-permission android:name="android.permission.START_ANY_ACTIVITY" />
     <uses-permission android:name="android.permission.INTERACT_ACROSS_USERS_FULL" />
     <uses-permission android:name="android.permission.GET_TOP_ACTIVITY_INFO" />
-    
+
     <!-- WindowManager -->
     <uses-permission android:name="android.permission.INTERNAL_SYSTEM_WINDOW" />
     <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
@@ -68,6 +68,9 @@
     <!-- Alarm clocks -->
     <uses-permission android:name="com.android.alarm.permission.SET_ALARM" />
 
+    <!-- Keyguard -->
+    <uses-permission android:name="android.permission.CONTROL_KEYGUARD" />
+
     <application
         android:persistent="true"
         android:allowClearUserData="false"