Revert of Use a token to initialise ChannelMojo and MojoApplication everywhere.

content/browser/gpu/gpu_process_host.cc

Index: content/browser/gpu/gpu_process_host.cc
diff --git a/content/browser/gpu/gpu_process_host.cc b/content/browser/gpu/gpu_process_host.cc
index 5a636bcae69af13245c71339e7bc522c9889a5f5..fcf2ff3ac8957bc983289caa35a4fad05d2e9926 100644
--- a/content/browser/gpu/gpu_process_host.cc
+++ b/content/browser/gpu/gpu_process_host.cc
@@ -43,7 +43,6 @@
 #include "content/public/browser/render_widget_host_view_frame_subscriber.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
-#include "content/public/common/mojo_channel_switches.h"
 #include "content/public/common/result_codes.h"
 #include "content/public/common/sandbox_type.h"
 #include "content/public/common/sandboxed_process_launcher_delegate.h"
@@ -548,8 +547,8 @@
   if (channel_id.empty())
     return false;
 
-  DCHECK(!mojo_application_host_);
-  mojo_application_host_.reset(new MojoApplicationHost);
+  if (!SetupMojo())
+    return false;
 
   gpu::GpuPreferences gpu_preferences = GetGpuPreferencesFromCommandLine();
   if (in_process_) {
@@ -557,8 +556,7 @@
     DCHECK(g_gpu_main_thread_factory);
     in_process_gpu_thread_.reset(
         g_gpu_main_thread_factory(InProcessChildThreadParams(
-            channel_id, base::MessageLoop::current()->task_runner(),
-            std::string(), mojo_application_host_->GetToken()),
+            channel_id, base::MessageLoop::current()->task_runner()),
             gpu_preferences));
     base::Thread::Options options;
 #if defined(OS_WIN)
@@ -579,6 +577,12 @@
     return false;
 
   return true;
+}
+
+bool GpuProcessHost::SetupMojo() {
+  DCHECK(!mojo_application_host_);
+  mojo_application_host_.reset(new MojoApplicationHost);
+  return mojo_application_host_->Init();
 }
 
 void GpuProcessHost::RouteOnUIThread(const IPC::Message& message) {
@@ -904,6 +908,14 @@
 void GpuProcessHost::OnProcessLaunched() {
   UMA_HISTOGRAM_TIMES("GPU.GPUProcessLaunchTime",
                       base::TimeTicks::Now() - init_start_time_);
+
+  base::ProcessHandle handle;
+  if (in_process_)
+    handle = base::GetCurrentProcessHandle();
+  else
+    handle = process_->GetData().handle;
+
+  mojo_application_host_->Activate(this, handle);
 }
 
 void GpuProcessHost::OnProcessLaunchFailed() {
@@ -975,8 +987,6 @@
 #endif
   cmd_line->AppendSwitchASCII(switches::kProcessType, switches::kGpuProcess);
   cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
-  cmd_line->AppendSwitchASCII(switches::kMojoApplicationChannelToken,
-                              mojo_application_host_->GetToken());
 
 #if defined(OS_WIN)
   if (GetContentClient()->browser()->ShouldUseWindowsPrefetchArgument())