gc triggering performance

Change-Id: Ie76d2db7d0a9c1fe296c915adb3651f1881ea846
Merge branch 'master' of https://android.googlesource.com/platform/frameworks/native into kitkat-dev
Merge branch 'master' of https://android.googlesource.com/platform/frameworks/native into kitkat-dev
Merge branch 'master' of https://android.googlesource.com/platform/frameworks/native into kitkat-dev
Merge branch 'master' of https://android.googlesource.com/platform/frameworks/native into kitkat-dev
Merge branch 'master' of https://android.googlesource.com/platform/frameworks/native into kitkat-dev
Merge branch 'master' of https://android.googlesource.com/platform/frameworks/native into kitkat-dev
Merge remote-tracking branch 'md/kitkat-master' into kitkat-master
Merge branch 'kitkat-master' of github.com:maddoggin/platform_frameworks_native into kitkat-master