Update from https://crrev.com/308331

gpu/command_buffer/service/gpu_switches.cc

Index: gpu/command_buffer/service/gpu_switches.cc
diff --git a/gpu/command_buffer/service/gpu_switches.cc b/gpu/command_buffer/service/gpu_switches.cc
index 7298140cfbcb152d23533abcdc5ac8c6e6d8b480..a2d43e9c4dfd7f18772d7dbe47f2dcfb9266a4dd 100644
--- a/gpu/command_buffer/service/gpu_switches.cc
+++ b/gpu/command_buffer/service/gpu_switches.cc
@@ -68,6 +68,14 @@ const char kEnableThreadedTextureMailboxes[] =
 // 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,
@@ -86,6 +94,8 @@ const char* kGpuSwitches[] = {
   kEnableShareGroupAsyncTextureUpload,
   kEnableUnsafeES3APIs,
   kEnableSubscribeUniformExtension,
+  kGLShaderIntermOutput,
+  kEmulateShaderPrecision,
 };
 
 const int kNumGpuSwitches = arraysize(kGpuSwitches);