Start the process of choosing the correct compression format

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 #include "GrGLContext.h"
@@ skipping 540 matching lines @@
     if (!hasLATC) {
         hasLATC = ctxInfo.hasExtension("GL_AMD_compressed_3DC_texture");
         if (hasLATC) {
             alias = k3DC_LATCAlias;
         }
     }
 
     fConfigTextureSupport[kLATC_GrPixelConfig] = hasLATC;
     fLATCAlias = alias;
 
-    // Check for R11_EAC
-    if (kGL_GrGLStandard == standard) {
-        fConfigTextureSupport[kR11_EAC_GrPixelConfig] =
-            version >= GR_GL_VER(4, 3) || ctxInfo.hasExtension("GL_ARB_ES3_compatibility");
-    } else {
+    // Check for R11_EAC ... We don't support R11_EAC on desktop, as most
+    // cards default to decompressing the textures in the driver, and is
+    // generally slower.
+    if (kGL_GrGLStandard != standard) {
         fConfigTextureSupport[kR11_EAC_GrPixelConfig] = version >= GR_GL_VER(3, 0);
     }
 
     // Check for ASTC
     fConfigTextureSupport[kASTC_12x12_GrPixelConfig] = 
         ctxInfo.hasExtension("GL_KHR_texture_compression_astc_hdr") ||
         ctxInfo.hasExtension("GL_KHR_texture_compression_astc_ldr") ||
         ctxInfo.hasExtension("GL_OES_texture_compression_astc");
 
     // Check for floating point texture support
@@ skipping 260 matching lines @@
     r.appendf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
     r.appendf("Fragment coord conventions support: %s\n",
              (fFragCoordsConventionSupport ? "YES": "NO"));
     r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
     r.appendf("Use non-VBO for dynamic data: %s\n",
              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
     r.appendf("Full screen clear is free: %s\n", (fFullClearIsFree ? "YES" : "NO"));
     r.appendf("Drops tile on zero divide: %s\n", (fDropsTileOnZeroDivide ? "YES" : "NO"));
     return r;
 }