Add command buffer support for EXT_sRGB_write_control

gpu/command_buffer/tests/gl_test_utils.cc

Index: gpu/command_buffer/tests/gl_test_utils.cc
diff --git a/gpu/command_buffer/tests/gl_test_utils.cc b/gpu/command_buffer/tests/gl_test_utils.cc
index bf860a685bef74abed25a8bede665ec695ee4c2a..f10a919439493466edd96c65fcd4e29b20760eec 100644
--- a/gpu/command_buffer/tests/gl_test_utils.cc
+++ b/gpu/command_buffer/tests/gl_test_utils.cc
@@ -71,9 +71,13 @@ GLuint LoadFragmentShader(unsigned target, const gfx::Size& size) {
 }
 
 bool GLTestHelper::HasExtension(const char* extension) {
-  std::string extensions(
-      reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS)));
-  return extensions.find(extension) != std::string::npos;
+  // Pad with an extra space to ensure that |extension| is not a substring of
+  // another extension.
+  std::string extensions =
+      std::string(reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS))) +
+      " ";
+  std::string extension_padded = std::string(extension) + " ";
+  return extensions.find(extension_padded) != std::string::npos;
 }
 
 bool GLTestHelper::CheckGLError(const char* msg, int line) {