Support for measuring page load times.

An app can attached a pending intent to an intent sent to the browser
which will be send when the load completes. The browser will fill in
the timestamp of when the page load completed, and details of preloading
success or otherwise if this was used.

Bug: 5259031
Change-Id: I2d025caabd6055ac25f06e69897a03d5c57c4f41
4 files changed