Hook ANGLE_request_extension up to the passthrough cmd decoder.

third_party/WebKit/Source/platform/graphics/gpu/Extensions3DUtil.cpp

Index: third_party/WebKit/Source/platform/graphics/gpu/Extensions3DUtil.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/gpu/Extensions3DUtil.cpp b/third_party/WebKit/Source/platform/graphics/gpu/Extensions3DUtil.cpp
index c15baff9cd520de86eff9fdcc7314f77d44d488a..e9f46598fb6deed5cac370a50de8e2a35d47825d 100644
--- a/third_party/WebKit/Source/platform/graphics/gpu/Extensions3DUtil.cpp
+++ b/third_party/WebKit/Source/platform/graphics/gpu/Extensions3DUtil.cpp
@@ -74,6 +74,10 @@ bool Extensions3DUtil::isExtensionEnabled(const String& name) {
   return m_enabledExtensions.contains(name);
 }
 
+bool Extensions3DUtil::isExtensionRequestable(const String& name) {
+  return m_requestableExtensions.contains(name);
+}
+
 bool Extensions3DUtil::canUseCopyTextureCHROMIUM(GLenum destTarget,
                                                  GLenum destFormat,
                                                  GLenum destType,