Adds associated interface support between RenderFrameHost and RenderFrame.
Introduces a new content::AssociatedInterfaceRegistry and
content::AssociatedInterfaceProvider to serve as Channel-associated
interface counterparts to their shell namesakes.
RenderFrameHost and RenderFrame each have both of these things on them,
and they're routed to the other side using a new RouteProvider interface
buried in RenderProcessHostImpl / ChildThreadImpl on either end.
Also adds a WebContentsInterfaceRegistry to every WebContents,
and a helper WebContentsFrameBindingSet<T> to allow consumers to
very easily manage the lifetime of associated interface bindings
for each frame in a WebContents.
See the follow-up patch for example usage.
Part a series of CLs to enable and demonstrate WebContents associated
interfaces:
1. https://codereview.chromium.org/2309513002
2. https://codereview.chromium.org/2316963005
3. This CL
4. https://codereview.chromium.org/2310583002
BUG=612500
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation
Review-Url: https://codereview.chromium.org/2310563002
Cr-Commit-Position: refs/heads/master@{#418717}
33 files changed
