[Android] Add UMA SB download size in background and foreground.

[Android] Add UMA SB download size in background and foreground.

On Android, we'd like to know how much data downloaded when app
is in foreground and background.

The changes adds an API for application to notify protocol manager
about status changes.

BUG=376029
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=273985

[klobag.chromium, 2014-05-30 05:38:34]

lgtm

[Scott Hess - ex-Googler, 2014-05-30 16:08:21]

lgtm otherwise

https://chromiumcodereview.appspot.com/303233002/diff/1/chrome/browser/safe_b...
File chrome/browser/safe_browsing/protocol_manager.cc (right):

https://chromiumcodereview.appspot.com/303233002/diff/1/chrome/browser/safe_b...
chrome/browser/safe_browsing/protocol_manager.cc:716:
UMA_HISTOGRAM_COUNTS("SB2.UpdateSize", update_size_);
This should probably just be outside the conditional entirely for consistency
across the fleet.

[Feng Qian, 2014-05-30 17:44:14]

The CQ bit was checked by feng@chromium.org

[commit-bot: I haz the power, 2014-05-30 17:46:53]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/feng@chromium.org/303233002/20001

[commit-bot: I haz the power, 2014-05-30 23:27:45]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_clang_dbg/bui...)

[commit-bot: I haz the power, 2014-05-31 01:45:44]

Change committed as 273985