Revert of Use the desktop GL core profile on Linux when ES3 support is requested.

gpu/command_buffer/service/shader_translator.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/shader_translator.h"
 
 #include <string.h>
 #include <GLES2/gl2.h>
 #include <algorithm>
 
@@ skipping 99 matching lines @@
     ShCompileOptions driver_bug_workarounds) {
   // Make sure Init is called only once.
   DCHECK(compiler_ == NULL);
   DCHECK(shader_type == GL_FRAGMENT_SHADER || shader_type == GL_VERTEX_SHADER);
   DCHECK(shader_spec == SH_GLES2_SPEC || shader_spec == SH_WEBGL_SPEC ||
          shader_spec == SH_GLES3_SPEC || shader_spec == SH_WEBGL2_SPEC);
   DCHECK(resources != NULL);
 
   g_translator_initializer.Get();
 
-  ShShaderOutput shader_output = SH_ESSL_OUTPUT;
-  switch (glsl_implementation_type) {
-    case kGlsl:
+  ShShaderOutput shader_output;
+  if (glsl_implementation_type == kGlslES) {
+    shader_output = SH_ESSL_OUTPUT;
+  } else {
+    // TODO(kbr): clean up the tests of shader_spec and
+    // gfx::GetGLImplementation(). crbug.com/471960
+    if (shader_spec == SH_WEBGL2_SPEC ||
+        gfx::GetGLImplementation() ==
+            gfx::kGLImplementationDesktopGLCoreProfile) {
+      shader_output = SH_GLSL_CORE_OUTPUT;
+    } else {
       shader_output = SH_GLSL_COMPATIBILITY_OUTPUT;
-      break;
-    case kGlslCoreProfile:
-      shader_output = SH_GLSL_CORE_OUTPUT;
-      break;
-    case kGlslES:
-      // Handled in initialization above.
-      break;
-    default:
-      NOTREACHED();
-      break;
+    }
   }
 
   {
     TRACE_EVENT0("gpu", "ShConstructCompiler");
     compiler_ = ShConstructCompiler(
         shader_type, shader_spec, shader_output, resources);
   }
   implementation_is_glsl_es_ = (glsl_implementation_type == kGlslES);
   driver_bug_workarounds_ = driver_bug_workarounds;
   return compiler_ != NULL;
@@ skipping 75 matching lines @@
                     destruction_observers_,
                     OnDestruct(this));
 
   if (compiler_ != NULL)
     ShDestruct(compiler_);
 }
 
 }  // namespace gles2
 }  // namespace gpu