New log format, Manual log generation, plus logging of invalidates

bug:5062896

Added features to TileProfiler, updated jni interface to allow querying of
arbitrary log data via strings. Depends on the following webkit change:

https://android-git.corp.google.com/g/#change,122779

For new logging jni interface, and logging of invalidates.

Change-Id: I80ba6702b87e86ec76e5b0eafde45f4ef3a80ad3