Timeline: scale impl-side frames overview according to device pixel ratio
Timeline: scale impl-side frames overview according to device pixel ratio

We used to have impl-side frames window height hardcoded and not scaled to
device pixel ratio, hence the window looked too small on hi-dpi devices.

TBR=pfeldman@chromium.org

BUG=

Review URL: https://codereview.chromium.org/113533006

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@164286 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs