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

[detail level 123]

pp	The C++ interface to the Pepper API
deprecated
ScriptableObject
internal
DirectoryEntryArrayOutputAdapterWithStorage
CallbackOutputTraits< std::vector< DirectoryEntry > >
IsSame
IsSame< A, A >
IsBaseOf
InheritIf
InheritIf< T, true >
GenericCallbackOutputTraits
ResourceCallbackOutputTraits
CallbackOutputTraits
CallbackOutputTraits< Var >
CallbackOutputTraits< bool >
GenericVectorCallbackOutputTraits
ResourceVectorCallbackOutputTraits
CallbackOutputTraits< std::vector< T > >
CallbackOutputTraits< std::vector< pp::Var > >
CallbackOutputTraits< PassFileHandle >
ArrayOutputAdapterBase
ArrayOutputAdapter
ResourceArrayOutputAdapter
ArrayOutputAdapterWithStorage
VarArrayOutputAdapterWithStorage
ResourceArrayOutputAdapterWithStorage
Audio
AudioConfig
CompletionCallback
CompletionCallbackWithOutput
Compositor
CompositorLayer
Core	APIs related to memory management, time, and threads
AudioInput_Dev
Buffer_Dev
DeviceRef_Dev
RemovableStorage_Dev
ResourceArray_Dev
ArrayOutputCallbackData
URLUtil_Dev
VideoCaptureClient_Dev
VideoCapture_Dev
DirectoryEntry
FileIO	The `FileIO` class represents a regular file
FileRef
FileSystem
Fullscreen	Allowing you to check and toggle fullscreen mode
Graphics2D
Graphics3D	This class represents a 3D rendering context in the browser
Graphics3DClient
HostResolver
ImageData
InputEvent
MouseInputEvent	This class handles mouse events
WheelInputEvent
KeyboardInputEvent
TouchInputEvent
IMEInputEvent
Instance
InstanceHandle
MessageHandler
MessageLoop
Module
MouseCursor
MouseLock
NetAddress	The `NetAddress` class represents a network address
NetworkList
NetworkMonitor
NetworkProxy
Point	A 2 dimensional point with 0,0 being the upper-left starting coordinate
FloatPoint
FileIO_Private
HostResolverPrivate
InstancePrivate
NetAddressPrivate
PassFileHandle
TCPServerSocketPrivate
TCPSocketPrivate
UDPSocketPrivate
VarPrivate
OutException
X509CertificatePrivate
Rect
FloatRect
Resource	A reference counted module resource
BufferingListener_Samsung
DeviceControlSamsung
DRMListener_Samsung	Listener for receiving DRM related events
ElementaryStream_Samsung
AudioElementaryStream_Samsung
VideoElementaryStream_Samsung
TextElementaryStream_Samsung
ESDataSource_Samsung
ExtensionSystemSamsung
ExtensionSystemSamsungWRT
GestureInputEventSamsung
MediaControl_Samsung
MediaDataSource_Samsung
MediaEventsListener_Samsung	Listener for receiving player or playback related events
MediaMetadataListener_Samsung	Listener for receiving media metadata changes
MediaPlayer_Samsung
MediaSource_Samsung
ProgramScheduleSamsung
SefClientSamsung
ServiceListSamsung
SourceBuffer_Samsung
StreamParser_Samsung
UDPSocketExtensionSamsung
URLDataSource_Samsung
Size	A size of an object based on width and height
FloatSize	A size of an object based on width and height
TCPSocket
TextInputController
TouchPoint	Wrapper class for PP_TouchPoint
UDPSocket
URLLoader
URLRequestInfo	URLRequestInfo provides an API for creating and manipulating URL requests
URLResponseInfo	URLResponseInfo provides an API for examining URL responses
Var	A generic type used for passing data types between the module and the page
DontManage
Null	Special value passed to constructor to make `NULL`
OutException
VarArray
VarArrayBuffer
VarDictionary
View
WebSocket
T