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

components/nacl/browser/nacl_process_host.cc

Index: components/nacl/browser/nacl_process_host.cc
diff --git a/components/nacl/browser/nacl_process_host.cc b/components/nacl/browser/nacl_process_host.cc
index b16b6d86c1fac28c75b4686fb88c16954a6155ba..b8bb6bde096ad30a31403ccfc218bd64b30ed20a 100644
--- a/components/nacl/browser/nacl_process_host.cc
+++ b/components/nacl/browser/nacl_process_host.cc
@@ -48,10 +48,11 @@
 #include "ppapi/host/host_factory.h"
 #include "ppapi/host/ppapi_host.h"
 #include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/shared_impl/ppapi_constants.h"
 #include "ppapi/shared_impl/ppapi_nacl_plugin_args.h"
-#include "ppapi/shared_impl/ppapi_switches.h"
 
 #if defined(OS_POSIX)
+
 #include <fcntl.h>
 
 #include "ipc/ipc_channel_posix.h"
@@ -233,6 +234,9 @@ struct NaClProcessHost::NaClInternal {
 
 // -----------------------------------------------------------------------------
 
+unsigned NaClProcessHost::keepalive_throttle_interval_milliseconds_ =
+    ppapi::kKeepaliveThrottleIntervalDefaultMilliseconds;
+
 NaClProcessHost::NaClProcessHost(const GURL& manifest_url,
                                  int render_view_id,
                                  uint32 permission_bits,
@@ -354,6 +358,12 @@ void NaClProcessHost::EarlyStartup() {
   NaClBrowser::GetDelegate()->SetDebugPatterns(nacl_debug_mask);
 }
 
+// static
+void NaClProcessHost::SetPpapiKeepAliveThrottleForTesting(
+    unsigned milliseconds) {
+  keepalive_throttle_interval_milliseconds_ = milliseconds;
+}
+
 void NaClProcessHost::Launch(
     NaClHostMessageFilter* nacl_host_message_filter,
     IPC::Message* reply_msg,
@@ -858,10 +868,11 @@ void NaClProcessHost::OnPpapiChannelsCreated(
     ppapi::PpapiNaClPluginArgs args;
     args.off_the_record = nacl_host_message_filter_->off_the_record();
     args.permissions = permissions_;
+    args.keepalive_throttle_interval_milliseconds =
+        keepalive_throttle_interval_milliseconds_;
     CommandLine* cmdline = CommandLine::ForCurrentProcess();
     DCHECK(cmdline);
     std::string flag_whitelist[] = {
-      switches::kPpapiKeepAliveThrottle,
       switches::kV,
       switches::kVModule,
     };