Decompress ETC texture data when there is no native support.

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index dafa6caccd71a3c2772943f7ecc79212d51b26f4..784ff48304c7170d5d2dc8855e73c93b892ebd81 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -137,7 +137,8 @@ FeatureInfo::FeatureFlags::FeatureFlags()
       ext_multisample_compatibility(false),
       ext_blend_func_extended(false),
       ext_read_format_bgra(false),
-      desktop_srgb_support(false) {}
+      desktop_srgb_support(false),
+      arb_es3_compatability(false) {}
 
 FeatureInfo::FeatureInfo() {
   InitializeBasicState(base::CommandLine::InitializedForCurrentProcess()
@@ -644,6 +645,12 @@ void FeatureInfo::InitializeFeatures() {
     validators_.read_pixel_format.AddValue(GL_BGRA_EXT);
   }
 
+  // GL_ARB_ES3_compatibility adds support for some ES3 texture formats that are
+  // not supported in desktop GL
+  feature_flags_.arb_es3_compatability =
+      extensions.Contains("GL_ARB_ES3_compatibility") &&
+      !gl_version_info_->is_es;
+
   // glGetInteger64v for timestamps is implemented on the client side in a way
   // that it does not depend on a driver-level implementation of
   // glGetInteger64v. The GPUTimer class which implements timer queries can also