Cancellation of queries for search suggestions.

Using CancellableSignal to enable cancellation of queries for search
suggestions.

Search App needs this change to cancel queries for search suggestions which are
no longer valid due to some user action.

Change-Id: Iad5aaccd322142cd7917722a2eda8207604050d7
Import translations. DO NOT MERGE

Change-Id: If806471dd9fa617e7dc2a2f225c912d635bd7853
Auto-generated-cl: translation import
Import translations. DO NOT MERGE

Change-Id: I3121f05aa1774470e3aebb798a26478d5dfe5f81
Auto-generated-cl: translation import
Merge tag 'android-4.3.1_r1' into HEAD

Android 4.3.1 Release 1