DCHECK if shader compilation fails that it's due to context loss.

gpu/command_buffer/client/gles2_interface.h

Index: gpu/command_buffer/client/gles2_interface.h
diff --git a/gpu/command_buffer/client/gles2_interface.h b/gpu/command_buffer/client/gles2_interface.h
index 0b0bc514f2489822582482a66fa8806237cd5e12..0b47301a84cdf53ce2e0caea680b13e979c49731 100644
--- a/gpu/command_buffer/client/gles2_interface.h
+++ b/gpu/command_buffer/client/gles2_interface.h
@@ -24,6 +24,10 @@ class GLES2Interface {
   // it means we can easily edit the non-auto generated parts right here in
   // this file instead of having to edit some template or the code generator.
   #include "gpu/command_buffer/client/gles2_interface_autogen.h"
+
+  // This method is implemented entirely on the client side by checking for
+  // errors.
+  virtual GLboolean IsContextLost() = 0;

[danakj, 2015/06/08 20:57:10]

I am pretty sure putting this method here is wrong. In fact mojo code is
including mojo_gles2_impl_autogen.h directly, so this just doesn't work unless I
add indirection like we use elsewhere.

But I didn't see how to add this via the autogen scripts without adding it to
the cmd_buffer_functions.txt file, and we don't need a glIsContextLost()
function, right?

[piman, 2015/06/08 21:01:57]

I suppose what we'd want to add to GLES2Interface is a
glGetGraphicsResetStatusKHR from
https://www.opengl.org/registry/specs/KHR/robustness.txt


It can be purely implemented without going to the GPU process, so that's why
adding it to cmd_buffer_functions.txt feels like overkill (we don't actually
need that command in the command buffer), but if not doing so requires massive
amounts of hackery, then maybe we can just add it and noop the decoder side.

 };
 
 }  // namespace gles2