Rename kHeapProfilingModeNoStack mode to kHeapProfilingModeBackground

We would need more information in background traces than just context.
To enable categories in future, change the mode name to background.
Use CaptureMode::PSEUDO_STACK in Background mode.

BUG=773188

Change-Id: I2dcb71f554b7084b442a0977dca6413e2235d704
Reviewed-on: https://chromium-review.googlesource.com/707789
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Primiano Tucci <primiano@chromium.org>
Commit-Queue: Siddhartha S <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#507760}

CrOS-Libchrome-Original-Commit: 4cafb7acf00f59b31ef9bbe2d42117c41d66a26a
4 files changed
tree: b941938292f4c17e05696491e2c554621798b8ae
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/