Same thing but with arrays. attached

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Noticed that we will need to expose Array length still.

Safari does that at the end of the preview line. 

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Here's a good testcase: https://gist.github.com/anonymous/11c6d73205c43f72e53ae347489e5d28

This is data I'm currently trying to explore. It's massively easier in current WebKit inspector. Tonic is OK, but really slow. 

In Chrome it's a LOT of clicking to investigate.

 Issue 670220  has been merged into this issue.

Additionally, we could add previews next to the collapsed ranges "[0...99]" to see:
"[0...99] [0, 0, 0, ...]"

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> Additionally, we could add previews next to the collapsed ranges 

eh. not really a huge deal to me. let's leave this out of scope.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5

commit 8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5
Author: luoe <luoe@chromium.org>
Date: Tue May 16 04:11:47 2017

DevTools: enable object previews experiment by default

BUG= 607681 

Review-Url: https://codereview.chromium.org/2881053003
Cr-Commit-Position: refs/heads/master@{#472014}

[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-Object-overwritten-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-dir-es6-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-dir-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-edit-property-value-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-eval-exception-report-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-eval-global-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-eval-object-literal-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-eval-scoped-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-eval-throw-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-eval-undefined-override-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-format-es6-2-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-format-es6-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-format-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-functions-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-log-object-with-getter-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-log-toString-object-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-object-preview-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-save-to-temp-var-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/console-tainted-globals-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/exception-objects-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/console/worker-eval-contains-stack-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/extensions/extensions-sidebar-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/extensions/extensions-sidebar.html
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/sources/debugger-ui/debugger-expand-scope-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/sources/debugger-ui/debugger-inline-values-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/sources/debugger-ui/debugger-save-to-temp-var-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/sources/debugger/debugger-es6-harmony-scopes-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/sources/debugger/debugger-scope-minified-variables-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/sources/debugger/debugger-scope-resolve-this-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/LayoutTests/inspector/sources/debugger/properties-special-expected.txt
[modify] https://crrev.com/8cd4a51cd17b2b672793c6308e3ce4aa0f86adb5/third_party/WebKit/Source/devtools/front_end/main/Main.js