Update trackpad pinch-zoom code for corrected scale semantics
In https://codereview.chromium.org/254783004 the semantics of the scale
parameter for GesturePinchUpdate on Mac is being corrected to be a scale
factor (1.0 no zoom) instead of a weird magnification value (where 0 means
no zoom). This is important because GesturePinchUpdate events are
coalesced together by multipling (not adding) their scale values.
This CL updates the browser zoom logic to compensate for this change in
scale values.
BUG=289887
Review URL: https://codereview.chromium.org/255843004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266556 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed
