Provide BreakpadGetCrashReportCount() and -[BreakpadController
getCrashReportCount:]

This provides the ability for clients to query the number of crash reports
that are waiting to upload.

Patch by KiYun Roe <kiyun@chromium.org>

BUG=547

Review URL: https://breakpad.appspot.com/714002/


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1234 4c0a9323-5329-0410-9bdc-e9ce6186880e