Added to QML_RENDERER_TIMING logic to capture most render bottlenecks.

The typical bottlenecks during rendering are usually compiling
shader programs, uploading textures and preparing glyphs,
so add profiling data around them.

Change-Id: I9c330a0f6b769836d303a035b2c0dce832842aec
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>