LGTM.

http://codereview.chromium.org/875001/diff/1/2
File src/runtime.cc (right):

http://codereview.chromium.org/875001/diff/1/2#newcode2087
src/runtime.cc:2087: struct StringMatchState {
Consider making this a class and moving BoyerMoore variants
initialization here to methods like SwitchToBoyerMoore*(pattern, start).

http://codereview.chromium.org/875001/diff/1/2#newcode2089
src/runtime.cc:2089: StringMatchState(int pattern_length)
explicit

http://codereview.chromium.org/875001/diff/1/2#newcode2199
src/runtime.cc:2199: int badness;
It might be less fragile to use state->badness directly below.

http://codereview.chromium.org/875001/diff/1/2#newcode4256
src/runtime.cc:4256:
Too many empty lines.

http://codereview.chromium.org/875001/diff/1/2#newcode4264
src/runtime.cc:4264: unsigned int max_split) {
unsigned int is dangerous. Can we just use int here?

http://codereview.chromium.org/875001/diff/1/2#newcode4280
src/runtime.cc:4280: void inline FindStringIndices(Vector<const schar>
subject,
FindCharIndices?

http://codereview.chromium.org/875001/diff/1/2#newcode4283
src/runtime.cc:4283: unsigned int max_split) {
See above.

http://codereview.chromium.org/875001/diff/1/2#newcode4302
src/runtime.cc:4302: CONVERT_NUMBER_CHECKED(uint32_t, max_split, Uint32,
args[2]);
Why not use the name from spec and from string.js ("limit")?

http://codereview.chromium.org/875001/diff/1/2#newcode4314
src/runtime.cc:4314: int initial_capacity =
Can this be simplified to Min<uint32_t>(kMaxInitialListCapacity,
max_split)?

http://codereview.chromium.org/875001/diff/1/2#newcode4375
src/runtime.cc:4375: HandleScope localLoopHandle;
noCamelCasePlease.

http://codereview.chromium.org/875001/diff/1/2#newcode4379
src/runtime.cc:4379: elements->set(i, *substring, UPDATE_WRITE_BARRIER);
UPDATE_WRITE_BARRIER is the default.

http://codereview.chromium.org/875001

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