Here are the classes, structs, unions and interfaces with brief descriptions:

PP_ArrayOutput
PP_AudioTrackInfo
PP_CompletionCallback
PP_DirectoryEntry
PP_EncryptedSubsampleDescription
PP_EPGEvent
PP_ESPacket
PP_ESPacketEncryptionInfo
PP_FileInfo
PP_FloatPoint
PP_FloatRect
PP_FloatSize
PP_Frames
PP_GamepadSampleData
PP_GamepadsSampleData
PP_GFXRect
PP_GFXSize
PP_HostResolver_Hint
PP_HostResolver_Private_Hint
PP_ImageDataDesc
PP_InputEvent_Character
PP_InputEvent_Key
PP_InputEvent_Mouse
PP_InputEvent_Wheel
PP_MulticastMembership
PP_NaClFileInfo
PP_NetAddress_IPv4
PP_NetAddress_IPv6
PP_NetAddress_Private
PP_Picture_Dev
PP_PictureBuffer_Dev
PP_PNaClOptions
PP_Point
PP_RatingInfo
PP_Rational
PP_Rect
PP_Sample
PP_SearchCriteria
PP_Size
PP_SP_AudioDecoderConfig
PP_SP_AudioDecoderConfig_0_9
PP_SP_VideoDecoderConfig
PP_SP_VideoDecoderConfig_0_9
PP_TextTrackInfo
PP_TimeRange
PP_TouchPoint
PP_URLComponent_Dev
PP_URLComponents_Dev
PP_Var
PP_VarValue
PP_VideoBitstreamBuffer_Dev
PP_VideoCaptureDeviceInfo_Dev
PP_VideoTrackInfo
PPB_Audio_1_0
PPB_Audio_1_1
PPB_AudioConfig_1_0
PPB_AudioConfig_1_1
PPB_AudioElementaryStream_Samsung_0_1
PPB_AudioInput_Dev_0_2
PPB_AudioInput_Dev_0_3
PPB_Buffer_Dev_0_4
PPB_Compositor_0_1
PPB_CompositorLayer_0_1
PPB_CompositorLayer_0_2
PPB_Console_1_0
PPB_Core_1_0
PPB_DeviceControl_Samsung_0_1
PPB_DeviceRef_Dev_0_1
PPB_ElementaryStream_Samsung_0_1
PPB_ESDataSource_Samsung_0_1
PPB_ExtensionSystem_Samsung_0_1
PPB_FileIO_1_0
PPB_FileIO_1_1
PPB_FileIO_Private_0_1
PPB_FileRef_1_0
PPB_FileRef_1_1
PPB_FileRef_1_2
PPB_FileSystem_1_0
PPB_Fullscreen_1_0
PPB_Gamepad_1_0
PPB_GestureInputEvent_Samsung_0_1
PPB_Graphics2D_1_0
PPB_Graphics2D_1_1
PPB_Graphics3D_1_0
PPB_HostResolver_1_0
PPB_HostResolver_Private_0_1
PPB_ImageData_1_0
PPB_IMEInputEvent_1_0
PPB_InputEvent_1_0
PPB_Instance_1_0
PPB_Instance_Private_0_1
PPB_KeyboardInputEvent_1_0
PPB_KeyboardInputEvent_1_2
PPB_MediaDataSource_Samsung_0_1
PPB_MediaPlayer_Samsung_0_1
PPB_MediaSource_Samsung_0_10
PPB_MediaSource_Samsung_0_9
PPB_Memory_Dev_0_1
PPB_MessageLoop_1_0
PPB_Messaging_1_0
PPB_Messaging_1_2
PPB_MouseCursor_1_0
PPB_MouseInputEvent_1_0
PPB_MouseInputEvent_1_1
PPB_MouseLock_1_0
PPB_NaCl_Private_1_0
PPB_NetAddress_1_0
PPB_NetAddress_Private_0_1
PPB_NetAddress_Private_1_0
PPB_NetAddress_Private_1_1
PPB_NetworkList_1_0
PPB_NetworkMonitor_1_0
PPB_NetworkProxy_1_0
PPB_OpenGLES2
PPB_OpenGLES2_1_0
PPB_OpenGLES2ChromiumEnableFeature
PPB_OpenGLES2ChromiumEnableFeature_1_0
PPB_OpenGLES2ChromiumMapSub
PPB_OpenGLES2ChromiumMapSub_1_0
PPB_OpenGLES2DrawBuffers_Dev
PPB_OpenGLES2DrawBuffers_Dev_1_0
PPB_OpenGLES2FramebufferBlit
PPB_OpenGLES2FramebufferBlit_1_0
PPB_OpenGLES2FramebufferMultisample
PPB_OpenGLES2FramebufferMultisample_1_0
PPB_OpenGLES2InstancedArrays
PPB_OpenGLES2InstancedArrays_1_0
PPB_OpenGLES2Query
PPB_OpenGLES2Query_1_0
PPB_OpenGLES2VertexArrayObject
PPB_OpenGLES2VertexArrayObject_1_0
PPB_ProgramSchedule_Samsung_0_2
PPB_Proxy_Private
PPB_RemovableStorage_Dev_0_1
PPB_ResourceArray_Dev_0_1
PPB_SefClient_Samsung_0_1
PPB_ServiceList_Samsung_0_2
PPB_SourceBuffer_Samsung_0_10
PPB_StreamParser_Samsung_0_10
PPB_StreamParser_Samsung_0_9
PPB_SystemInfo_1_0
PPB_TCPServerSocket_Private_0_1
PPB_TCPServerSocket_Private_0_2
PPB_TCPSocket_1_0
PPB_TCPSocket_1_1
PPB_TCPSocket_Private_0_3
PPB_TCPSocket_Private_0_4
PPB_TCPSocket_Private_0_5
PPB_Testing_Dev_0_7
PPB_Testing_Dev_0_8
PPB_Testing_Dev_0_9
PPB_Testing_Dev_0_91
PPB_Testing_Dev_0_92
PPB_Testing_Dev_0_93
PPB_Testing_Dev_0_94
PPB_Testing_Dev_0_95
PPB_TextElementaryStream_Samsung_0_1
PPB_TextInputController_1_0
PPB_TouchInputEvent_1_0
PPB_UDPSocket_1_0
PPB_UDPSocket_Private_0_2
PPB_UDPSocket_Private_0_3
PPB_UDPSocket_Private_0_4
PPB_UDPSocketExtension_Samsung_0_1
PPB_URLDataSource_Samsung_0_1
PPB_URLLoader_1_0
PPB_URLLoaderTrusted_0_3
PPB_URLRequestInfo_1_0
PPB_URLResponseInfo_1_0
PPB_URLUtil_Dev_0_6
PPB_Var_1_0
PPB_Var_1_1
PPB_Var_1_2
PPB_Var_Deprecated
PPB_VarArray_1_0
PPB_VarArrayBuffer_1_0
PPB_VarDictionary_1_0
PPB_VideoCapture_Dev_0_2
PPB_VideoCapture_Dev_0_3
PPB_VideoElementaryStream_Samsung_0_1
PPB_View_1_0
PPB_View_1_1
PPB_View_1_2
PPB_WebSocket_1_0
PPB_WheelInputEvent_1_0
PPB_X509Certificate_Private_0_1
PPP_BufferingListener_Samsung_0_1
PPP_Class_Deprecated
PPP_DRMListener_Samsung_0_1
PPP_Graphics3D_1_0
PPP_InputEvent_0_1
PPP_Instance_1_0
PPP_Instance_1_1
PPP_Instance_Private_0_1
PPP_MediaControl_Samsung_0_9
PPP_MediaEventsListener_Samsung_0_1
PPP_MediaMetadataListener_Samsung_0_1
PPP_MediaSource_Samsung_0_10
PPP_MediaSource_Samsung_0_9
PPP_MessageHandler_0_2
PPP_Messaging_1_0
PPP_MouseLock_1_0
PPP_StreamParser_Samsung_0_9
PPP_VideoCapture_Dev_0_1