Revert of Replace --ppapi-keep-alive-throttle command line switch with IPC parameter. (https://codereview.chromium.org/191633002/)

Reason for revert:
This introduced a static initializer in nacl_process_host

Original issue's description:
> Replace --ppapi-keep-alive-throttle command line switch with IPC parameter.
> 
> Part of a broad effort to reduce the number of command line switches.
> 
> BUG=350510
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=256436

TBR=dmichael@chromium.org,mseaborn@chromium.org,inferno@chromium.org,tsepez@chromium.org,scheib@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=350510

Review URL: https://codereview.chromium.org/196763002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256450 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256450
[telemetry] Turn on GPU benchmarking extension for all runs

This patch turns on GPU benchmarking extension for all runs [unless opted out via BrowserOptions]. This is done mainly to simplify the actions system. Right now, we have to programmatically inspect a pageset's actions in order to determine if it might
eventually scroll or do a synthetic gesture, and then if it will, we add in the gpu
benchmarking extension. This is not possible when pagesets are python-based.

In reality, the only side effect of the extension being on is that render stats are tracked. We believe this to be effectively free: rather than trying to add more complexity into the actions and pageset system in order to figure out if gestures are needed, I propose we try moving this to always be on and see if we can get by. The intent in the long term is to make gesture creation available on devtools or in the platform, anyway, so this seems like a low architectural risk.

Review URL: https://codereview.chromium.org/189463007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256451 0039d316-1c4b-4281-b951-d872f2087c98
Fix page is not updated issue when mVSyncNotificationEnabled is setted false.
Sometime unregisterVSyncListener() is called by ContentViewCore::destroy() when we switch to another ContentView.

R=skyostil@chromium.org

Review URL: https://codereview.chromium.org/187263006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256453 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256453