Fix crash when translated ANGLE shader source has length zero.

gpu/command_buffer/service/program_manager.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/program_manager.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 454 matching lines @@
     GLint max_len = 0;
     glGetShaderiv(info->service_id(),
                   GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE,
                   &max_len);
     scoped_array<char> temp(new char[max_len]);
     GLint len = 0;
     glGetTranslatedShaderSourceANGLE(
         info->service_id(), max_len, &len, temp.get());
     DCHECK(max_len == 0 || len < max_len);
     DCHECK(len == 0 || temp[len] == '\0');
-    info->UpdateTranslatedSource(temp.get());
+    info->UpdateTranslatedSource(max_len ? temp.get() : NULL);
   }
 
   GLint status = GL_FALSE;
   glGetShaderiv(info->service_id(), GL_COMPILE_STATUS, &status);
   if (status) {
     info->SetStatus(true, "", translator);
     if (program_cache_) {
       const char* untranslated_source = source ? source->c_str() : "";
       program_cache_->ShaderCompilationSucceeded(untranslated_source);
     }
@@ skipping 691 matching lines @@
     info->ClearUniforms(&zero_);
   }
 }
 
 int32 ProgramManager::MakeFakeLocation(int32 index, int32 element) {
   return index + element * 0x10000;
 }
 
 }  // namespace gles2
 }  // namespace gpu