getInstalledRelatedApps: Add browser-side Mojo service (stub).
Adds the InstalledAppProvider Mojo service for getInstalledRelatedApps,
which takes a list of related apps (from the app manifest) and filters
out those apps that are not installed.
The stub implementation always returns the empty list (Android-specific
real implementation to follow).
Updated layout tests to mock out the Mojo service and therefore fully
test the IDL bindings code.
Based on a CL by dhnishi:
https://codereview.chromium.org/1756793004/
BUG=587623
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation
Review-Url: https://codereview.chromium.org/2671683002
Cr-Commit-Position: refs/heads/master@{#456652}
17 files changed
