[gpu] Fix feature detection for ext_texture_norm16.

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 8a114b4fe05ffa443364cd19e0957ca2d92673fc..8782e5288810c2e4c9ae987ca6965a8f85cf62b3 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -1312,7 +1312,9 @@ void FeatureInfo::InitializeFeatures() {
   }
   UMA_HISTOGRAM_BOOLEAN("GPU.TextureRG", feature_flags_.ext_texture_rg);
 
-  if (gl_version_info_->is_desktop_core_profile ||
+  if ((gl_version_info_->is_desktop_core_profile &&
+       (gl_version_info_->IsAtLeastGL(3, 0) ||
+        extensions.Contains("GL_ARB_texture_rg"))) ||

[Ken Russell (switch to Gerrit), 2017/06/13 23:51:03]

This isn't necessary. Looking more deeply, GL_ARB_texture_rg was folded into
OpenGL 3.0, and is_desktop_core_profile implies a minimum of OpenGL 3.2.

       extensions.Contains("GL_EXT_texture_norm16")) {
     feature_flags_.ext_texture_norm16 = true;
     AddExtensionString("GL_EXT_texture_norm16");