Implement GetTranslatedShaderSource in the passthrough cmd decoder.

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc

 // Copyright (c) 2016 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/gles2_cmd_decoder_passthrough.h"
 
 #include "base/strings/string_number_conversions.h"
 
 namespace gpu {
 namespace gles2 {
@@ skipping 2576 matching lines @@
 error::Error GLES2DecoderPassthroughImpl::DoGetUniformsES3CHROMIUM(
     GLuint program,
     std::vector<uint8_t>* data) {
   NOTIMPLEMENTED();
   return error::kNoError;
 }
 
 error::Error GLES2DecoderPassthroughImpl::DoGetTranslatedShaderSourceANGLE(
     GLuint shader,
     std::string* source) {
-  NOTIMPLEMENTED();
+  FlushErrors();
+  GLuint service_id = GetShaderServiceID(shader, resources_);
+  GLint translated_source_length = 0;
+  glGetShaderiv(service_id, GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE,
+                &translated_source_length);
+  if (FlushErrors()) {
+    return error::kNoError;
+  }
+
+  if (translated_source_length > 0) {
+    std::vector<char> buffer(translated_source_length, 0);
+    glGetTranslatedShaderSourceANGLE(service_id, translated_source_length,
+                                     nullptr, buffer.data());
+    *source = std::string(buffer.data());
+  }
   return error::kNoError;
 }
 
 error::Error GLES2DecoderPassthroughImpl::DoSwapBuffersWithDamageCHROMIUM(
     GLint x,
     GLint y,
     GLint width,
     GLint height) {
   gfx::SwapResult result = surface_->PostSubBuffer(x, y, width, height);
   if (result == gfx::SwapResult::SWAP_FAILED) {
@@ skipping 627 matching lines @@
 GLES2DecoderPassthroughImpl::DoUniformMatrix4fvStreamTextureMatrixCHROMIUM(
     GLint location,
     GLboolean transpose,
     const volatile GLfloat* defaultValue) {
   NOTIMPLEMENTED();
   return error::kNoError;
 }
 
 }  // namespace gles2
 }  // namespace gpu