transcoding: Add start/pause/resume event update to interface.

This will also help for testing from java service and the benchmarking
later as we need to capture all the job event and log the timing.

Bug: 145628554
Bug: 154734285
Test: Unit test
Change-Id: If4f2016de08c8e25e67b50548241f1182f3dcb93
diff --git a/media/libmediatranscoding/tests/TranscodingClientManager_tests.cpp b/media/libmediatranscoding/tests/TranscodingClientManager_tests.cpp
index db171ce..82983bd 100644
--- a/media/libmediatranscoding/tests/TranscodingClientManager_tests.cpp
+++ b/media/libmediatranscoding/tests/TranscodingClientManager_tests.cpp
@@ -64,6 +64,12 @@
         return Status::ok();
     }
 
+    Status onTranscodingStarted(int32_t /*in_jobId*/) override { return Status::ok(); }
+
+    Status onTranscodingPaused(int32_t /*in_jobId*/) override { return Status::ok(); }
+
+    Status onTranscodingResumed(int32_t /*in_jobId*/) override { return Status::ok(); }
+
     Status onTranscodingFinished(int32_t in_jobId,
                                  const TranscodingResultParcel& in_result) override {
         EXPECT_EQ(in_jobId, in_result.jobId);