Add a way to send the resource percentage signal to the RC.

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 946c39323f984a210b4b21278f5d4974afd7e732..0a02a382aed04e481db5995d99d9749209c69f43 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -801,6 +801,8 @@ split_static_library("browser") {
     "ntp_tiles/chrome_popular_sites_factory.h",
     "offline_items_collection/offline_content_aggregator_factory.cc",
     "offline_items_collection/offline_content_aggregator_factory.h",
+    "offline_pages/offliner_user_data.cc",

[Dmitry Titov, 2017/05/18 02:28:09]

These should be below under "if (enable_offline_pages)" section.

[Pete Williamson, 2017/05/24 01:01:50]

I moved these, but ended up putting them back.

When I moved them, the tests in PageLoadMetrics failed, because they need access
to these files.
  
I tried putting them in "test_support", but then the browser unit tests end up
with two copies of these files.

One thing that I didn't try (which I can if you think it is the right thing to
do) is to make a new gn target "external_test_support" with just these two
files, and using that target from the PageLoadMetrics unit tests.

[Dmitry Titov, 2017/05/24 23:09:34]

This does not sound right. This is 'browser' target, it has nothing to do with
building unittests. I may be wrong here, but none of other offline_pages files
are included unconditionally and there are other unittests depending on them.
Could you double-check please?

+    "offline_pages/offliner_user_data.h",
     "page_load_metrics/browser_page_track_decider.cc",
     "page_load_metrics/browser_page_track_decider.h",
     "page_load_metrics/experiments/delay_navigation_throttle.cc",