tree 069d1e2db4b93b80f5410ee5c797fe9404a344a4
parent 25c3c34c81b38c7afacbbd456236e1bfaaa1e0eb
author Tim Volodine <timvolodine@google.com> 1510348056 +0000
committer Tim Volodine <timvolodine@google.com> 1513178874 +0000

Add WebView Tracing API.

Add classes/interfaces necessary for the support of tracing API
in WebView.

In particular:
- TracingController: singleton class for starting and stopping
  tracing and inspecting tracing status.
- TracingConfig: holds tracing configuration, such as categories
  to filter and the tracing mode.
- TracingOutputStream: interface for capturing tracing data.
- TracingFileOutputStream: supporting class for capturing tracing
  data to a file.

BUG: 63750258
Test: in progress

Change-Id: I7decd486788766fc8dfa766ae027c02f9d4c6f80