Add CefThread interface (issue #1632)

include/internal/cef_thread_internal.h

@@ -46,8 +46,10 @@ extern "C" {
 
 #if defined(OS_WIN)
 typedef DWORD cef_platform_thread_id_t;
+#define kInvalidPlatformThreadId 0U
 #elif defined(OS_POSIX)
 typedef pid_t cef_platform_thread_id_t;
+#define kInvalidPlatformThreadId 0
 #endif
 
 ///
@@ -57,8 +59,10 @@ CEF_EXPORT cef_platform_thread_id_t cef_get_current_platform_thread_id();
 
 #if defined(OS_WIN)
 typedef DWORD cef_platform_thread_handle_t;
+#define kInvalidPlatformThreadHandle 0U
 #elif defined(OS_POSIX)
 typedef pthread_t cef_platform_thread_handle_t;
+#define kInvalidPlatformThreadHandle 0
 #endif
 
 ///

include/internal/cef_types.h

@@ -1396,6 +1396,73 @@ typedef enum {
   TID_RENDERER,
 } cef_thread_id_t;
 
+///
+// Thread priority values listed in increasing order of importance.
+///
+typedef enum {
+  ///
+  // Suitable for threads that shouldn't disrupt high priority work.
+  ///
+  TP_BACKGROUND,
+
+  ///
+  // Default priority level.
+  ///
+  TP_NORMAL,
+
+  ///
+  // Suitable for threads which generate data for the display (at ~60Hz).
+  ///
+  TP_DISPLAY,
+
+  ///
+  // Suitable for low-latency, glitch-resistant audio.
+  ///
+  TP_REALTIME_AUDIO,
+} cef_thread_priority_t;
+
+///
+// Message loop types. Indicates the set of asynchronous events that a message
+// loop can process.
+///
+typedef enum {
+  ///
+  // Supports tasks and timers.
+  ///
+  ML_TYPE_DEFAULT,
+
+  ///
+  // Supports tasks, timers and native UI events (e.g. Windows messages).
+  ///
+  ML_TYPE_UI,
+
+  ///
+  // Supports tasks, timers and asynchronous IO events.
+  ///
+  ML_TYPE_IO,
+} cef_message_loop_type_t;
+
+///
+// Windows COM initialization mode. Specifies how COM will be initialized for a
+// new thread.
+///
+typedef enum {
+  ///
+  // No COM initialization.
+  ///
+  COM_INIT_MODE_NONE,
+
+  ///
+  // Initialize COM using single-threaded apartments.
+  ///
+  COM_INIT_MODE_STA,
+
+  ///
+  // Initialize COM using multi-threaded apartments.
+  ///
+  COM_INIT_MODE_MTA,
+} cef_com_init_mode_t;
+
 ///
 // Supported value types.
 ///