Replace --ppapi-keep-alive-throttle command line switch with IPC parameter.

ppapi/proxy/plugin_globals.cc

Index: ppapi/proxy/plugin_globals.cc
diff --git a/ppapi/proxy/plugin_globals.cc b/ppapi/proxy/plugin_globals.cc
index d34adf1e634798427f4c641da7c9a861c27a9f64..d361ae1191950b56cf9844ab0aa0983536199bf8 100644
--- a/ppapi/proxy/plugin_globals.cc
+++ b/ppapi/proxy/plugin_globals.cc
@@ -13,15 +13,10 @@
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/ppb_message_loop_proxy.h"
 #include "ppapi/proxy/resource_reply_thread_registrar.h"
+#include "ppapi/shared_impl/ppapi_constants.h"
 #include "ppapi/shared_impl/proxy_lock.h"
 #include "ppapi/thunk/enter.h"
 
-namespace {
-
-const int kKeepaliveThrottleIntervalDefault = 5000;
-
-}  // namespace
-
 namespace ppapi {
 namespace proxy {
 
@@ -64,7 +59,7 @@ PluginGlobals::PluginGlobals()
           new ResourceReplyThreadRegistrar(GetMainThreadMessageLoop())),
       plugin_recently_active_(false),
       keepalive_throttle_interval_milliseconds_(
-          kKeepaliveThrottleIntervalDefault),
+          ppapi::kKeepaliveThrottleIntervalDefaultMilliseconds),
       weak_factory_(this) {
   DCHECK(!plugin_globals_);
   plugin_globals_ = this;
@@ -85,7 +80,7 @@ PluginGlobals::PluginGlobals(PerThreadForTest per_thread_for_test)
           new ResourceReplyThreadRegistrar(GetMainThreadMessageLoop())),
       plugin_recently_active_(false),
       keepalive_throttle_interval_milliseconds_(
-          kKeepaliveThrottleIntervalDefault),
+          kKeepaliveThrottleIntervalDefaultMilliseconds),
       weak_factory_(this) {
   DCHECK(!plugin_globals_);
 }
@@ -186,12 +181,13 @@ void PluginGlobals::MarkPluginIsActive() {
     if (!GetBrowserSender() || !base::MessageLoop::current())
       return;
     GetBrowserSender()->Send(new PpapiHostMsg_Keepalive());
-
-    GetMainThreadMessageLoop()->PostDelayedTask(FROM_HERE,
+    DCHECK(keepalive_throttle_interval_milliseconds_);
+    GetMainThreadMessageLoop()->PostDelayedTask(
+        FROM_HERE,
         RunWhileLocked(base::Bind(&PluginGlobals::OnReleaseKeepaliveThrottle,
                                   weak_factory_.GetWeakPtr())),
         base::TimeDelta::FromMilliseconds(
-            keepalive_throttle_interval_milliseconds()));
+            keepalive_throttle_interval_milliseconds_));
   }
 }
 
@@ -225,11 +221,7 @@ MessageLoopResource* PluginGlobals::loop_for_main_thread() {
   return loop_for_main_thread_.get();
 }
 
-int PluginGlobals::keepalive_throttle_interval_milliseconds() const {
-  return keepalive_throttle_interval_milliseconds_;
-}
-
-void PluginGlobals::set_keepalive_throttle_interval_milliseconds(int i) {
+void PluginGlobals::set_keepalive_throttle_interval_milliseconds(unsigned i) {
   keepalive_throttle_interval_milliseconds_ = i;
 }