Optimizations to improve run times of cast_unittests.

Overall, this change improved the total "--single-process-tests" run
time from 14599 ms to 6958 ms on a high-performance developer desktop.
This over-50% improvement should also carry over into sanitizer test
runs, and help to alleviate test timeouts (e.g., on Dr Memory bots).

I identified all individual tests that were running over 100 ms, and
reduced their run-time by:

1. Reducing loop iterations to just the amount needed to appropriately
test the implementation.

2. Reducing data volume by using smaller-sized VideoFrames in tests.

3. Optimizing media::cast::FakeSingleThreadTaskRunner, the task
scheduler used by most of the tests.

4. Merging multiple end-to-end tests into a smaller set that still tests
all the same end-to-end functionality.

BUG=530842,487033

Review URL: https://codereview.chromium.org/1551063002

Cr-Commit-Position: refs/heads/master@{#367431}

1 files changed, 3 insertions, 1 deletions

diff --git a/media/cast/logging/logging_defines.h b/media/cast/logging/logging_defines.h
index 4780d84..455f85d 100644
--- a/media/cast/logging/logging_defines.h
+++ b/media/cast/logging/logging_defines.h
@@ -37,7 +37,9 @@ enum CastLoggingEvent {
   PACKET_RTX_REJECTED,
   // Receiver side packet events.
   PACKET_RECEIVED,
-  kNumOfLoggingEvents = PACKET_RECEIVED
+};
+enum {
+  kNumOfLoggingEvents = PACKET_RECEIVED + 1,
 };
 
 const char* CastLoggingToString(CastLoggingEvent event);