Get rid of ChannelInit::SetSingleProcessIOTaskRunner()

The globally-set TaskRunner doesn't work because some child
thread can run inside the browser process even when other
child threads run in their own processes.
For example, there is a configuration where GpuChildThread
being in-process while RenderThreadImpl isn't.

It is troublesome once non-renderer child processes adopt
ChannelMojo.

This CL eliminates the global in-process IO task runner
and instead, passes an IO runnner for each thread
if it is configured as an in-process mode.

Note that InProcessChildThreadParams object is introuced to
clarify that the parameter is for in-process mode.

This is a spin-off from https://codereview.chromium.org/960693003/.

R=jamesr@chromium.org, rockot@chromium.org, jam@chromium.org
BUG=377980

Review URL: https://codereview.chromium.org/987693005

Cr-Commit-Position: refs/heads/master@{#321047}

1 files changed, 6 insertions, 5 deletions

diff --git a/content/gpu/in_process_gpu_thread.cc b/content/gpu/in_process_gpu_thread.cc
index 8a7818d..dfd9d35 100644
--- a/content/gpu/in_process_gpu_thread.cc
+++ b/content/gpu/in_process_gpu_thread.cc
@@ -9,9 +9,9 @@
 
 namespace content {
 
-InProcessGpuThread::InProcessGpuThread(const std::string& channel_id)
+InProcessGpuThread::InProcessGpuThread(const InProcessChildThreadParams& params)
     : base::Thread("Chrome_InProcGpuThread"),
-      channel_id_(channel_id),
+      params_(params),
       gpu_process_(NULL) {
 }
 
@@ -23,7 +23,7 @@ void InProcessGpuThread::Init() {
   gpu_process_ = new GpuProcess();
   // The process object takes ownership of the thread object, so do not
   // save and delete the pointer.
-  gpu_process_->set_main_thread(new GpuChildThread(channel_id_));
+  gpu_process_->set_main_thread(new GpuChildThread(params_));
 }
 
 void InProcessGpuThread::CleanUp() {
@@ -31,8 +31,9 @@ void InProcessGpuThread::CleanUp() {
   delete gpu_process_;
 }
 
-base::Thread* CreateInProcessGpuThread(const std::string& channel_id) {
-  return new InProcessGpuThread(channel_id);
+base::Thread* CreateInProcessGpuThread(
+    const InProcessChildThreadParams& params) {
+  return new InProcessGpuThread(params);
 }
 
 }  // namespace content