| The page load metrics subsystem captures and records UMA metrics related to |
| page loading. This includes page timing metrics, such as time to first |
| paint, as well as page interaction metrics, such as number of page loads |
| aborted before first paint. |
| |
| The page load metrics subsystem is shared by Chrome and WebView, but not |
| supported on iOS, as it requires hooks into Blink for page timing metrics that |
| are unavailable on iOS. |
| |
| This component has the following structure and these directories follow the rule |
| that //content follows. If your new file needs to depend on something that |
| //content disallows, you need to consider to place it outside |
| //components/page_load_metrics/, e.g. //chrome/browser/page_load_metrics/ for |
| Chrome, or //components/page_load_metrics/google/ if it depends on Google specific |
| properties and is used from multiple embedders, e.g. Chrome and WebView. |
| - //components/page_load_metrics/browser/: browser process code |
| - //components/page_load_metrics/common/: code shared by browser and renderer, such |
| as IPC messages |
| - //components/page_load_metrics/renderer/: renderer process code |
| |
| For additional information on this subsystem, see |
| https://docs.google.com/document/d/1HJsJ5W2H_3qRdqPAUgAEo10AF8gXPTXZLUET4X4_sII/edit |
