Add video call handling for heads up notifications.

- Add isVideo method to the InCallUI call.
- Added cases and actions for isVideo to StatusBarNotifier.
- Added cases for isVideo for processing incoming call in the
full-screen experience in AnswerPresenter.
- Did what I figured would be some cleanup, to consolidate some
helper methods only ever called once, and reorder some methods
to be more alphabetical.
- Added new intent type for video calls (and revised old one for
audio calls), which are dispatched by the StatusBarNotifier and
received by the InCallApp.
- Update icons used, and deleted unused icons.

Bug: 16013878
Change-Id: If0a8d04e2ee6eaf8258ce6a677b22d55a584f9ab
diff --git a/InCallUI/res/values/strings.xml b/InCallUI/res/values/strings.xml
index 3c10302..19ba8a6 100644
--- a/InCallUI/res/values/strings.xml
+++ b/InCallUI/res/values/strings.xml
@@ -211,10 +211,10 @@
          scenarios such as accepting an incoming call or accepting a video call request.
          [CHAR LIMIT=40] -->
     <string name="notification_action_accept">Accept</string>
-    <!-- Label for "Decline" notification action. This is somewhat generic, and may refer to
+    <!-- Label for "Dismiss" notification action. This is somewhat generic, and may refer to
          scenarios such as declining an incoming call or declining a video call request.
          [CHAR LIMIT=40] -->
-    <string name="notification_action_decline">Decline</string>
+    <string name="notification_action_dismiss">Dismiss</string>
 
     <!-- Message for "call back" Action, which is displayed in the missed call notificaiton.
          The user will be able to call back to the person or the phone number.