perf-turbo.py merges a perf data file and a turbofan trace file into a
single json object which can then be piped to a file and uploaded to
turbolizer to display the profiling data in the disassembly. With the
changes, turbolizer now shows the event counts for instruction in
percentage form and with heatmap-stype colouring. Multiple different
events can be recorded at once with a new drop-down menu to select which
event to view the counts of. The documentation has been updated with
instructions. Using the script is optional and turbolizer retains
previous functionality if a trace without profiling data is uploaded.

BUG=None

Review-Url: https://codereview.chromium.org/2174803002
Cr-Commit-Position: refs/heads/master@{#38124}

- Remove duplicated CSS.
- Expand landing area of upload button.
- Give the toolbox a transparent white background.
- Make the phase-select box look nicer before file load.
- Remove the margin at the top of the screen.

The height of the margin was exactly the height of span#graph-toolbox,
and due to the semantics of position:relative, space was reserved for it
at the top of div#middle.

BUG=
R=danno

Review-Url: https://codereview.chromium.org/2164373002
Cr-Commit-Position: refs/heads/master@{#38003}

Fix bugs and add a few small useful features:

* Fix Schedule view to properly parse schedule output and respond to switching
  back to graph views.
* Add shorcuts for showing edges of selected nodes.
  - 'i' shows all inputs
  - 'o' shows all outputs
  - '1'-'9' shows all nodes nth input where 1 <= n <= 9
  - 'c' shows all control inputs
  - 'e' shows all effect inputs
* Holding the control key down when using a edge-showing shortcut toggles edge
  state rather the just showing.
* 'a' selects all nodes in graph view.
* Node selection is preserved between graph views and Schedule views.
* Holding control key down when using regular expression search shows currently
  hidden nodes that match the regex search.
* Pane expansion buttons now respond to clicks in entire button area.
* Default text in regex search box makes searching more discoverable.

Review-Url: https://codereview.chromium.org/2059193002
Cr-Commit-Position: refs/heads/master@{#36932}

Review-Url: https://codereview.chromium.org/729913004
Cr-Commit-Position: refs/heads/master@{#36351}