Adding Chrome Endure graph plotting code.

[Resubmission of issue 10832403 that was reverted in 10879112 because
it broke chromeOS due to executable bits being set on the files].

Chrome Endure refers to an endurance testing effort to study the effect
of memory bloat in webapps running in chrome.

This code is a fork of chrome's existing code for displaying performance
graphs.  It has become very specific to Chrome Endure, containing features
requested by users of Chrome Endure, and having the ability to display
performance results across time within a given test run (as compared to
the existing chrome perf graphs, which display data across test runs).

In addition to adding new features specific to Chrome Endure, the current
code removes some features that originally existed from chrome's perf
graphing code, which haven't been used for Chrome Endure.

This code has been running for awhile to display Chrome Endure perf
graphs, but hasn't been checked in until now.  Other users want to build on
top of this codebase to add new graphing features specific to Chrome Endure.

BUG=chromium-os:32302
TEST=Verified that graphs work well enough for current Chrome Endure purposes.

Review URL: https://chromiumcodereview.appspot.com/10899008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@153716 0039d316-1c4b-4281-b951-d872f2087c98

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