Added a unique command buffer ID for command buffers.

gpu/gles2_conform_support/egl/display.cc

Index: gpu/gles2_conform_support/egl/display.cc
diff --git a/gpu/gles2_conform_support/egl/display.cc b/gpu/gles2_conform_support/egl/display.cc
index d943cca3be11911f56fb97c1331e65e7295ec7ab..bc2610d81ab4c1faa00cedafa48ba4875c55826d 100644
--- a/gpu/gles2_conform_support/egl/display.cc
+++ b/gpu/gles2_conform_support/egl/display.cc
@@ -344,4 +344,12 @@ bool Display::IsGpuChannelLost() {
   return false;
 }
 
+gpu::CommandBufferNamespace Display::GetNamespaceID() const {
+  return gpu::kCommandBufferNamespace_InProcess;
+}
+
+uint64_t Display::GetCommandBufferID() const {
+  return 0;
+}
+
 }  // namespace egl