Add a new command buffer function glScheduleCALayerInUseQueryCHROMIUM.

gpu/GLES2/extensions/CHROMIUM/CHROMIUM_schedule_ca_layer.txt

 Name
 
     CHROMIUM_schedule_ca_layer
 
 Name Strings
 
     GL_CHROMIUM_schedule_ca_layer
 
 Version
 
@@ skipping 55 matching lines @@
     <bounds_rect> contains four values indicating the x, y, width, and height of
     the layer in pixels.
     <is_clipped> indicates if the layer should be clipped.
     <clip_rect> contains four values indicating the x, y, width, and height of
     the rectangle to clip the layer to, if it is to be clipped.
     <transform> contains sixteen values indicating the row major order 4x4
     transformation matrix to apply to the CALayer.
     <filter> will be used for both minification and magnification filtering. The
     only valid values are GL_LINEAR and GL_NEAREST.
 
+    The command
+
+       glScheduleCALayerInUseQueryCHROMIUM(GLsizei count, GLuint* textures);
+
+    schedules a query at the time of the next call to swap buffers. If the given
+    texture is backed by an IOSurface, then the query checks to see whether the
+    IOSurface is in use by the Window Server. Otherwise, the query returns
+    false. All the results will be returned with the swap ACK in
+    GpuCommandBufferMsg_SwapBuffersCompleted_Params. Clients should not destroy
+    any textures while they are being queried, as the swap ACK will use the
+    original texture id to identify the queried textures.
+
 Errors
 
     None.
 
 New State
 
     None.
 
 Revision History
 
+    6/13/2016    Add glScheduleCALayerInUseQueryCHROMIUM.
     4/12/2016    Add a parameter to support minification and magnification
                  filtering.
     12/16/2015   Add clipping and edge anti-aliasing.
     11/7/2015    Initial checkin