Guard the rework of documentElement|body.scrollTop/Left under a runtime flag

Blink is now (Nov 11, 2013) at a middle state of cross Web engine compatibility
with regards to documentElement and body scrollLeft/Top properties' behavior [1]:
1. documentElement works as per the spec.
2. body does not, and UseCounts the "improper" usage, keeping the existing
WebKit/Blink quirk behavior.

Given the amount of occurences that rely on the mutually exclusive behavior of
such properties [2], it is preferable to restore the original quirk behavior
and work on the new behavior under a runtime flag: ScrollTopLeftInterop.

In short, as Blink is now, websites that try to work around WebKit/Blink bug by
doing the below math are broken.

scrollOffset = documentElement.scrollTop + body.scrollTop [2]

[1] http://dev.w3.org/csswg/cssom-view/#dom-element-scrolltop
[2] http://bit.ly/17jiCMJ

BUG=314700
R=eseidel

Review URL: https://codereview.chromium.org/69143002

git-svn-id: svn://svn.chromium.org/blink/trunk@162166 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add crashing expectation for debugger-pause-in-internal.html

BUG=320477
TBR=pfeldman

Review URL: https://codereview.chromium.org/74833002

git-svn-id: svn://svn.chromium.org/blink/trunk@162167 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rename es => exceptionState in core/ (ex. dom/ and html/)

Relanding large patch incrementally, via CQ:
Rename es => exceptionState in other than bindings/
https://codereview.chromium.org/72363002/

Do in core/, then undo it in core/dom/ and core/html/, since in other CLs:
cd "$BLINK_DIR/Source/core" && \
    sed -ri '/"es"/ ! s/\<es\>/exceptionState/g' \
    $(git ls-files '*.cpp' '*.h')
cd "$BLINK_DIR/Source/core/dom" && \
    sed -ri 's/\<exceptionState\>/es/g' \
    $(git ls-files '*.cpp' '*.h')
cd "$BLINK_DIR/Source/core/html" && \
    sed -ri 's/\<exceptionState\>/es/g' \
    $(git ls-files '*.cpp' '*.h')

TBR=haraken

Review URL: https://codereview.chromium.org/73933002

git-svn-id: svn://svn.chromium.org/blink/trunk@162168 bbb929c8-8fbe-4397-9dbb-9b2b20218538