Restrict ETC1 power-of-two rounding to old IMG drivers.

gpu/command_buffer/common/capabilities.h

Index: gpu/command_buffer/common/capabilities.h
diff --git a/gpu/command_buffer/common/capabilities.h b/gpu/command_buffer/common/capabilities.h
index 9e38f5c00bcb6c19210011ddb34d4f236ce5dff4..60f7b0d44c3b78606a9a0ce84e5798c2850c5ef2 100644
--- a/gpu/command_buffer/common/capabilities.h
+++ b/gpu/command_buffer/common/capabilities.h
@@ -14,6 +14,7 @@ struct GPU_EXPORT Capabilities {
   bool egl_image_external;
   bool texture_format_bgra8888;
   bool texture_format_etc1;
+  bool texture_format_etc1_npot;
   bool texture_rectangle;
   bool iosurface;
   bool texture_usage;