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

PP_ArrayOutput
PP_AudioDecoderConfig
PP_CompletionCallback
PP_DecryptedBlockInfo
PP_DecryptedFrameInfo
PP_DecryptSubsampleDescription
PP_DecryptTrackingInfo
PP_DirectoryEntry
PP_EncryptedBlockInfo
PP_Ext_EventListener
PP_FileInfo
PP_FloatPoint
PP_FontDescription_Dev
PP_FontMetrics_Dev
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_NetAddress_IPv4
PP_NetAddress_IPv6
PP_NetAddress_Private
PP_Picture_Dev
PP_PictureBuffer_Dev
PP_Point
PP_PrintPageNumberRange_Dev
PP_PrintSettings_Dev
PP_Rect
PP_Size
PP_SP_AudioDecoderConfig
PP_SP_VideoDecoderConfig
PP_TextRun_Dev
PP_TimeRange
PP_TouchPoint
PP_TrueTypeFontDesc_Dev
PP_URLComponent_Dev
PP_URLComponents_Dev
PP_Var
PP_VarValue
PP_VideoBitstreamBuffer_Dev
PP_VideoCaptureDeviceInfo_Dev
PP_VideoDecoderConfig
PPB_Audio_1_0
PPB_Audio_1_1
PPB_AudioConfig_1_0
PPB_AudioConfig_1_1
PPB_AudioInput_Dev_0_2
PPB_AudioInput_Dev_0_3
PPB_AudioInput_Dev_0_4
PPB_Buffer_Dev_0_4
PPB_CharSet_Dev_0_4
PPB_Console_1_0
PPB_ContentDecryptor_Samsung_0_6
PPB_Core_1_0
PPB_Crypto_Dev_0_1
PPB_CursorControl_Dev_0_4
PPB_DeviceRef_Dev_0_1
PPB_Ext_Alarms_Dev_0_1
PPB_Ext_CrxFileSystem_Private_0_1
PPB_Ext_Events_Dev_0_1
PPB_Ext_Socket_Dev_0_1
PPB_Ext_Socket_Dev_0_2
PPB_FileChooser_Dev_0_5
PPB_FileChooser_Dev_0_6
PPB_FileIO_1_0
PPB_FileIO_1_1
PPB_FileIO_Private_0_1
PPB_FileRef_1_0
PPB_FileRef_1_1
PPB_FileRefPrivate_0_1
PPB_FileSystem_1_0
PPB_Find_Dev_0_3
PPB_Font_Dev_0_6
PPB_Fullscreen_1_0
PPB_Gamepad_1_0
PPB_GLESChromiumTextureMapping_Dev_0_1
PPB_Graphics2D_1_0
PPB_Graphics2D_1_1
PPB_Graphics2D_Dev_0_1
PPB_Graphics3D_1_0
PPB_HostResolver_1_0
PPB_HostResolver_Private_0_1
PPB_ImageData_1_0
PPB_IMEInputEvent_1_0
PPB_IMEInputEvent_Dev_0_1
PPB_IMEInputEvent_Dev_0_2
PPB_InputEvent_1_0
PPB_Instance_1_0
PPB_KeyboardInputEvent_1_0
PPB_KeyboardInputEvent_Dev_0_2
PPB_MediaSource_Samsung_0_9
PPB_Memory_Dev_0_1
PPB_MessageLoop_1_0
PPB_Messaging_1_0
PPB_MouseCursor_1_0
PPB_MouseInputEvent_1_0
PPB_MouseInputEvent_1_1
PPB_MouseLock_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_OpenGLES2ChromiumEnableFeature
PPB_OpenGLES2ChromiumMapSub
PPB_OpenGLES2FramebufferBlit
PPB_OpenGLES2FramebufferMultisample
PPB_OpenGLES2InstancedArrays
PPB_OpenGLES2Query
PPB_OutputProtection_Private_0_1
PPB_Printing_Dev_0_7
PPB_RemovableStorage_Dev_0_1
PPB_ResourceArray_Dev_0_1
PPB_Scrollbar_Dev_0_5
PPB_SefClient_Samsung_0_1
PPB_StreamParser_Samsung_0_9
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_TextInput_Dev_0_1
PPB_TextInput_Dev_0_2
PPB_TextInputController_1_0
PPB_TouchInputEvent_1_0
PPB_Trace_Event_Dev_0_1
PPB_Trace_Event_Dev_0_2
PPB_TrueTypeFont_Dev_0_1
PPB_UDPSocket_1_0
PPB_UDPSocket_Private_0_2
PPB_UDPSocket_Private_0_3
PPB_UDPSocket_Private_0_4
PPB_URLLoader_1_0
PPB_URLRequestInfo_1_0
PPB_URLResponseInfo_1_0
PPB_URLUtil_Dev_0_6
PPB_URLUtil_Dev_0_7
PPB_Var_1_0
PPB_Var_1_1
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_VideoDecoder_Dev_0_16
PPB_View_1_0
PPB_View_1_1
PPB_View_Dev_0_1
PPB_WebSocket_1_0
PPB_WheelInputEvent_1_0
PPB_Widget_Dev_0_3
PPB_Widget_Dev_0_4
PPB_X509Certificate_Private_0_1
PPB_Zoom_Dev_0_2
PPP_Class_Deprecated
PPP_ContentDecryptor_Samsung_0_6
PPP_Find_Dev
PPP_Graphics3D_1_0
PPP_InputEvent_0_1
PPP_Instance_1_0
PPP_Instance_1_1
PPP_MediaControl_Samsung_0_9
PPP_MediaSource_Samsung_0_9
PPP_Messaging_1_0
PPP_MouseLock_1_0
PPP_NetworkState_Dev_0_1
PPP_Printing_Dev_0_6
PPP_Scrollbar_Dev_0_2
PPP_Scrollbar_Dev_0_3
PPP_Selection_Dev_0_3
PPP_StreamParser_Samsung_0_9
PPP_TextInput_Dev_0_1
PPP_VideoCapture_Dev_0_1
PPP_VideoDecoder_Dev_0_10
PPP_VideoDecoder_Dev_0_11
PPP_VideoDecoder_Dev_0_9
PPP_Widget_Dev_0_2
PPP_Zoom_Dev_0_3