Update from https://crrev.com/308331

gpu/command_buffer/service/gpu_switches.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/gpu_switches.h"
 #include "base/basictypes.h"
 
 namespace switches {
 
 // Always return success when compiling a shader. Linking will still fail.
@@ skipping 50 matching lines @@
     "enable-subscribe-uniform-extension";
 
 // Simulates shared textures when share groups are not available. Not available
 // everywhere.
 const char kEnableThreadedTextureMailboxes[] =
     "enable-threaded-texture-mailboxes";
 
 // Enable OpenGL ES 3 APIs without proper service side validation.
 const char kEnableUnsafeES3APIs[] = "enable-unsafe-es3-apis";
 
+// Include ANGLE's intermediate representation (AST) output in shader
+// compilation info logs.
+const char kGLShaderIntermOutput[] = "gl-shader-interm-output";
+
+// Emulate ESSL lowp and mediump float precisions by mutating the shaders to
+// round intermediate values in ANGLE.
+const char kEmulateShaderPrecision[] = "emulate-shader-precision";
+
 const char* kGpuSwitches[] = {
   kCompileShaderAlwaysSucceeds,
   kDisableGLErrorLimit,
   kDisableGLSLTranslator,
   kDisableGpuDriverBugWorkarounds,
   kDisableShaderNameHashing,
   kEnableGPUCommandLogging,
   kEnableGPUDebugging,
   kEnableGPUServiceLoggingGPU,
   kDisableGpuProgramCache,
   kEnforceGLMinimums,
   kForceGpuMemAvailableMb,
   kGpuDriverBugWorkarounds,
   kGpuProgramCacheSizeKb,
   kDisableGpuShaderDiskCache,
   kEnableShareGroupAsyncTextureUpload,
   kEnableUnsafeES3APIs,
   kEnableSubscribeUniformExtension,
+  kGLShaderIntermOutput,
+  kEmulateShaderPrecision,
 };
 
 const int kNumGpuSwitches = arraysize(kGpuSwitches);
 
 }  // namespace switches