Decompress ETC texture data when there is no native support.

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/feature_info.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <vector>
@@ skipping 119 matching lines @@
       blend_equation_advanced(false),
       blend_equation_advanced_coherent(false),
       ext_texture_rg(false),
       chromium_image_ycbcr_420v(false),
       chromium_image_ycbcr_422(false),
       emulate_primitive_restart_fixed_index(false),
       ext_render_buffer_format_bgra8888(false),
       ext_multisample_compatibility(false),
       ext_blend_func_extended(false),
       ext_read_format_bgra(false),
-      desktop_srgb_support(false) {}
+      desktop_srgb_support(false),
+      arb_es3_compatibility(false) {}
 
 FeatureInfo::FeatureInfo() {
   InitializeBasicState(base::CommandLine::InitializedForCurrentProcess()
                            ? base::CommandLine::ForCurrentProcess()
                            : nullptr);
 }
 
 FeatureInfo::FeatureInfo(
     const GpuDriverBugWorkarounds& gpu_driver_bug_workarounds)
     : workarounds_(gpu_driver_bug_workarounds) {
@@ skipping 486 matching lines @@
   bool enable_read_format_bgra =
       extensions.Contains("GL_EXT_read_format_bgra") ||
       !gl_version_info_->is_es;
 
   if (enable_read_format_bgra) {
     feature_flags_.ext_read_format_bgra = true;
     AddExtensionString("GL_EXT_read_format_bgra");
     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_compatibility =
+      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
   // fallback to an implementation that does not depend on glGetInteger64v on
   // ES2. Thus we can enable GL_EXT_disjoint_timer_query on ES2 contexts even
   // though it does not support glGetInteger64v due to a specification bug.
   if (extensions.Contains("GL_EXT_disjoint_timer_query") ||
       extensions.Contains("GL_ARB_timer_query") ||
       extensions.Contains("GL_EXT_timer_query")) {
     AddExtensionString("GL_EXT_disjoint_timer_query");
@@ skipping 760 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu