[Android] Record UMA metrics after native initialization completes.

[Android] Record UMA metrics after native initialization completes.

Discoverd that we never got LibraryLoader.NativeLibraryHack in UMA
histograms server. Found that's because UMA session was not started
yet right after native libraries are loaded.

By delaying recording until UMA session is started, these stats
shown up in chrome://histograms.

BUG=311644
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289022

[Yaron, 2014-08-12 01:23:52]

lgtm

https://codereview.chromium.org/452923004/diff/1/base/android/java/src/org/ch...
File base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java
(right):

https://codereview.chromium.org/452923004/diff/1/base/android/java/src/org/ch...
base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java:230:
public static void onNativeInitializationComplete() {
Ideally you could register for this event but I see that's only possible
currently in the internal repo. Please file a cleanup bug as this is a signal we
should have upstream

[Feng Qian, 2014-08-12 16:47:01]

https://codereview.chromium.org/452923004/diff/1/base/android/java/src/org/ch...
File base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java
(right):

https://codereview.chromium.org/452923004/diff/1/base/android/java/src/org/ch...
base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java:230:
public static void onNativeInitializationComplete() {
Good to know the event mechanism. Filed the follow-up task:
https://code.google.com/p/chromium/issues/detail?id=402925

On 2014/08/12 01:23:52, Yaron wrote:
> Ideally you could register for this event but I see that's only possible
> currently in the internal repo. Please file a cleanup bug as this is a signal
we
> should have upstream

[Feng Qian, 2014-08-12 16:47:09]

The CQ bit was checked by feng@chromium.org

[commit-bot: I haz the power, 2014-08-12 16:50:03]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/feng@chromium.org/452923004/1

[commit-bot: I haz the power, 2014-08-12 18:08:55]

Change committed as 289022