Accessibility: Read the time correctly in quick settings.

The problem is that, for 12-hour locales, we cut the "a"
part of the time format out to show it in a separate
TextView so it can be animated independently of the actual
time. Unfortunately, while TTS is smart enough to pronounce
"1:15 AM" as /wʌn fɪftin eɪ ɛm/, "AM" on its own looks like
the English word "am" and is pronounced /æm/.

To fix this, a TextClock must be able to accept separate
formats for its content description than its presentation.
With this capability we can place the complete 12-hour time
format (including am/pm) in one of the views and suppress
the other one, so that the utterance creates an identical
experience to visual inspection: "1:15 AM" for all users.

Bug: 21718000
Change-Id: Ic9920d71ae4d4ad41ba86d7bd96f9a19b07e2108
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/policy/SplitClockView.java b/packages/SystemUI/src/com/android/systemui/statusbar/policy/SplitClockView.java
index 50e3977..faa1a28 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/policy/SplitClockView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/policy/SplitClockView.java
@@ -101,6 +101,8 @@
         }
         mTimeView.setFormat12Hour(timeString);
         mTimeView.setFormat24Hour(timeString);
+        mTimeView.setContentDescriptionFormat12Hour(formatString);
+        mTimeView.setContentDescriptionFormat24Hour(formatString);
         mAmPmView.setFormat12Hour(amPmString);
         mAmPmView.setFormat24Hour(amPmString);
     }