android: Report java exception in child

Enable JavaExceptionReporter for child processes so that unhandled java
exceptions generate crash reports.

Note this also requires fixing InitNonBrowserCrashReporterForAndroid so
that SetDumpWithoutCrashingFunction is called in child processes.

Tested with chrome://gpu-java-crash added in r447908, manually
enabling breakpad microdumps with local build, and adding
--enable-crash-reporter-for-testing. Verified microdump is generated
with the java stack information in logcat

BUG=680775

Review-Url: https://codereview.chromium.org/2677563006
Cr-Commit-Position: refs/heads/master@{#449000}
2 files changed