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This patch implements the mechanism for the tracing api in the chromium
part of android webview. Contains AwTracingController.java and its native
counterpart aw_tracing_controller.{h,cc} with JNI. There is not more
than one instance of AwTracingController which is created on first
call to getTracingController() in AwBrowserContext.

Also makes sure that the TraceRecordMode enum Java counterparts are
created in org.chromium.base.

BUG=781249

Change-Id: Ie407117efb97da0894f8441e9db5d1c5b60e5a7e
Reviewed-on: https://chromium-review.googlesource.com/824605
Commit-Queue: Tim Volodine <timvolodine@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526715}