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• O1OneofCase : UnitTest.Issues.TestProtos.TestJsonFieldOrdering
• O2OneofCase : UnitTest.Issues.TestProtos.TestJsonFieldOrdering
• ObservationFlags : WebCore::MutationObserver
• ObservedResults : JSC::ArithProfile
• OffsetType : WebCore::RenderTextLineBoxes
• OneofFieldOneofCase : Conformance.TestAllTypes , Google.Protobuf.TestProtos.OneofWellKnownTypes , Google.Protobuf.TestProtos.TestAllTypes
• Opcode : WebCore::XPath::EqTestOp , WebCore::XPath::LogicalOp , WebCore::XPath::NumericOp
• OpenHandshakeRole : webrtc::InternalDataChannelInit
• Operation : google::protobuf.internal::WireFormat , google::protobuf.internal::WireFormatLite , WebCore::HTMLConstructionSiteTask
• OperationType : WebCore::ClipPathOperation , WebCore::FilterOperation , WebCore::TransformOperation
• Option : cricket::PseudoTcp , rtc::Socket , WebCore::TypingCommand
• Options : rtc::PacketSocketFactory
• Orientation : WebCore::RenderDetailsMarker
• orientType : WebCore::OverflowEvent
• Origin : WebCore::SMILTimeWithOrigin , webrtc::MacDesktopConfiguration
• OriginalNode : TIntermTraverser
• OriginAttribute : WebCore::ImageCandidate
• OS : gpu::GPUTestConfig
• OutputType : webrtc::NetEqImpl
• OverflowType : WebCore::RenderRegion
• OverlayType : WebCore::PageOverlay
• OverSampleType : WebCore::WaveShaperNode , WebCore::WaveShaperProcessor