Pass initial size and GPU preference via context attributes

components/mus/gles2/command_buffer_driver.cc

Index: components/mus/gles2/command_buffer_driver.cc
diff --git a/components/mus/gles2/command_buffer_driver.cc b/components/mus/gles2/command_buffer_driver.cc
index b3821b9f4dec1acc7f5489955097dfc64cdf761a..1f3c882c891cd1010f56ef0283e2f4b4f10358de 100644
--- a/components/mus/gles2/command_buffer_driver.cc
+++ b/components/mus/gles2/command_buffer_driver.cc
@@ -117,8 +117,8 @@ bool CommandBufferDriver::Initialize(
     return false;
 
   // TODO(piman): virtual contexts, gpu preference.

[danakj, 2016/06/29 18:25:54]

can remove preference here :)

[piman, 2016/06/29 20:28:51]

So, I wouldn't say it's handled yet, the client still can't select the
gpu_preference, but we're ever so slightly closer to that. I moved and clarified
the TODO.

-  context_ = gl::init::CreateGLContext(gpu_state_->share_group(),
-                                       surface_.get(), gl::PreferIntegratedGpu);
+  context_ = gl::init::CreateGLContext(
+      gpu_state_->share_group(), surface_.get(), attrib_helper.gpu_preference);
   if (!context_.get())
     return false;
 
@@ -161,8 +161,8 @@ bool CommandBufferDriver::Initialize(
 
   gpu::gles2::DisallowedFeatures disallowed_features;
 
-  if (!decoder_->Initialize(surface_, context_, offscreen, gfx::Size(1, 1),
-                            disallowed_features, attrib_helper))
+  if (!decoder_->Initialize(surface_, context_, offscreen, disallowed_features,
+                            attrib_helper))
     return false;
 
   command_buffer_->SetPutOffsetChangeCallback(base::Bind(