Remove overloaded FloatPoint -> SkPoint type conversion.

Remove overloaded FloatPoint -> SkPoint type conversion, and replace it
with an explicit data() accessor.

BUG=

Review URL: https://codereview.chromium.org/222023006

git-svn-id: svn://svn.chromium.org/blink/trunk@170879 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Always expand retainers recursively until user root is reached

Now when user expands a retainer in heap snapshot the whole retaining chain will expand recursively until either root is reached or 20 levels are expanded.

BUG=None

Review URL: https://codereview.chromium.org/225973002

git-svn-id: svn://svn.chromium.org/blink/trunk@170880 bbb929c8-8fbe-4397-9dbb-9b2b20218538