commit f87bec89720d659aabfe964458a3d671ffdcfccc
author Philip Rogers <pdr@chromium.org> Tue May 14 21:23:23 2019
committer Commit Bot <commit-bot@chromium.org> Tue May 14 21:23:23 2019
tree ab28f846d87065f87841299bfb5f2ae302f3d9dd
parent dab54417fd06552b801b3639452a5799743762e0

Simplify the debugging of PaintChunks

PaintChunks can be printed using --vmodule=*paint_controller*=2 [1] but
the output format is verbose. This change introduces another verbosity
level to paint_controller:
1) Paint chunks and display item list in compact form.
  --vmodule=*paint_controller*=1
2) Paint chunks with detailed display item list.
  --vmodule=*paint_controller*=2
3) Paint chunks with detailed display item list with paint records.
  --vmodule=*paint_controller*=3

Sample output from --vmodule=*paint_controller*=1:
"chunks": [
  {
    "chunk": "LayoutSVGRoot 0x23d6a28338:LayoutSVGRoot svg class='qr':ClipPaintPhaseForeground:0",
    "state": "t:0x323d114b10 c:0x323d1c4a10 e:0x323d02c190",
    "displayItems": [
      "0x23d6a38018:LayoutSVGPath path:DrawingPaintPhaseForeground:0"
    ]
  },
  {
    "chunk": "InlineTextBox 'Text box' 0x23d6a60190:InlineTextBox 'Text box':DrawingPaintPhaseForeground:0",
    "state": "t:0x323d114840 c:0x323d1c48d0 e:0x323d02c190",
    "displayItems": [
      "0x23d6a60190:InlineTextBox 'Text box':DrawingPaintPhaseForeground:0",
      "0x23d6a60090:InlineTextBox 'text':DrawingPaintPhaseForeground:0",
      "0x23d6a60010:InlineTextBox 'more text':DrawingPaintPhaseForeground:0"
    ]
  }
]

[1] https://docs.google.com/document/d/1vgQY11pxRQUDAufxSsc2xKyQCKGPftZ5wZnjY2El4w8/edit#heading=h.me4dzticloz0

Change-Id: I87c02c16121d63edca4ba1255b3d5aff348013eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610494
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659659}