QmlProfiler: Add some indentation

Change-Id: I71a5ed05ccd219639a088fe73193d5263ca5880b
Reviewed-by: Ulf Hermann <ulf.hermann@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
QmlProfiler: Draw time marks only in visible area

The vertical Flickable element can get very large if certain
categories are expanded. If the time marks have to fill the whole
element the underlying buffers holding the pixmaps and/or OpenGL
data may overflow.

Task-number: QTCREATORBUG-10420

Change-Id: I45952e8237bb827a963e0e4e8deb060646c0c8f4
Reviewed-by: Ulf Hermann <ulf.hermann@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
QmlProfiler: Rename some variables to avoid shadowing of methods

Change-Id: Icdafee1bcc38812ace152d71c6302e130d1b6cf5
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
QmlProfiler: Restrict rendering of timeline to visible area

The timeline can cover a large vertical space. The introduction of
the Flickable element to navigate that space has reverted the effect
of commit 5eb057c7e. This change restores the performance
improvements and avoids overflows in the underlying buffers.

Change-Id: I86ddd66652ee0a26c81619682a883622072b0f87
Reviewed-by: Kai Koehne <kai.koehne@digia.com>