Keeping newer and older definitions for didActivateCompositor()

This patch has been added in order to land chromium side patch
https://codereview.chromium.org/137893025/ and then in turn land the blink side
patch https://codereview.chromium.org/138523003/

We need to keep both the definitions of didActivateCompositor in the blink side
to land the chromium side patch. Once the chromium side patch lands, we can
remove the old definition (i.e. function with unnecessary argument) and all the
corresponding calls to old function from the blink side as well.

BUG=None

Review URL: https://codereview.chromium.org/189263019

git-svn-id: svn://svn.chromium.org/blink/trunk@168910 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Revert r168885 "TimelinePanel: restore selectedRecord behevior by removing windowFilter."

It was committed manually and is breaking tests.

TBR=loislo

Review URL: https://codereview.chromium.org/194933003

git-svn-id: svn://svn.chromium.org/blink/trunk@168911 bbb929c8-8fbe-4397-9dbb-9b2b20218538