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This patch adds CrashKey to investigate where crashes occur.

LazyLineBreakIterator::IsBreakable() has inline and templates
that the stack quality is low.

Bug: 756624
Change-Id: I657b18aa1cb74b2587104352b4a3e826522b6ba8
Reviewed-on: https://chromium-review.googlesource.com/737710Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512825}