Don't fetch histograms from the same process.

content/browser/gpu/gpu_process_host.cc

Index: content/browser/gpu/gpu_process_host.cc
===================================================================
--- content/browser/gpu/gpu_process_host.cc	(revision 276253)
+++ content/browser/gpu/gpu_process_host.cc	(working copy)
@@ -348,6 +348,8 @@
       base::Bind(base::IgnoreResult(&GpuProcessHostUIShim::Create), host_id));
 
   process_.reset(new BrowserChildProcessHostImpl(PROCESS_TYPE_GPU, this));
+  if (in_process_)
+    process_->SetHandle(base::GetCurrentProcessHandle());

[piman, 2014/06/11 19:46:35]

Seems iffy... It will have side effects in other places (e.g.
OnChildDisconnected). Why not leaving it as kNullProcessHandle and test that
instead?

[Alexei Svitkine (slow), 2014/06/11 19:52:28]

I'm okay with that solution too. We can expand the documentation for the
|handle| field to mention what kNullProcessHandle may mean. As far as I could
tell, I think the correct description for it would be:

// The handle to the process. May have value kNullProcessHandle if no process
// exists - either because it hasn't been started yet or it's running in the
// current process.

Then, in the other files I can check for kNullProcessHandle. Do you prefer this
approach?

[piman, 2014/06/12 17:20:30]

Yes... I think the BrowserChildProcessHost's handle needs to accurately
represent the child process it owns, not the process that created it. If no
process was launched, then the handle is NULL.

 }
 
 GpuProcessHost::~GpuProcessHost() {