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    [debugger] Various break-related functionality in test wrapper · 83b560b0
    jgruber authored
    This CL adds simple implementation of break and stepping-related functionality
    as required by the debug-step.js test. This includes
    
    * stepOver, stepInto, stepOut
    * setBreakPoint
    * clearBreakPoint
    * evaluate
    
    Some of these, e.g. setBreakPoint are not fully implemented for all cases but
    only for the ones we need right now.
    
    One interesting result of this is that using the inspector protocol is roughly
    14x slower for debug-step.js (14s instead of 0.5s). One cause of this seems to
    be iteration over all object properties in toProtocolValue, which is used to
    serialize JS objects before being sent over the wire (e.g. FrameMirrors).  This
    is something that should be fixed at some point. In the meantime, the test now
    runs 100 instead of 1000 iterations.
    
    BUG=v8:5530
    
    Review-Url: https://codereview.chromium.org/2447073007
    Cr-Commit-Position: refs/heads/master@{#40636}
    83b560b0