DevTools: [HeapProfiler] Type of overview chart confuses the developers.
DevTools: [HeapProfiler] Type of overview chart confuses the developers.

Drawing code was refactored.

BUG=236352
TEST=none
R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/14068009

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@149340 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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