Use WS_POPUP for ash_unittests
- Layout test windows starting from (1,1) and move
  mouse to (0,0) so that they don't overlap unless
  test moves the cursor.
- Enabled disabled tests.
- RootWindowHostWin::SetBounds should move the window
  and call OnHostResized when the scale factor has changed.

This also seems to fix the desktop size limitation issue (148691)
probably because a popup window can be larger than the desktop size.

BUG=150986,157817,141577,148691
TEST=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=170621

Review URL: https://chromiumcodereview.appspot.com/11428066

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170673 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed