Introduce blink::ServiceProvider

Introduce blink::ServiceProvider

This CL is a warmup for making hyperlinks actually work. ServiceProvider lets
the embedder inject a bundle of services that are specific to the embedding
context (e.g., NavigatorHost). Services that are independent to the embedding
context can be injected via blink::Platform.

R=eseidel@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/1c63e03d2a6a0894e3824ee3aad7da838f0ae10e

[eseidel, 2014-10-31 17:48:57]

lgtm

https://codereview.chromium.org/696733003/diff/1/sky/engine/core/frame/FrameH...
File sky/engine/core/frame/FrameHost.h (right):

https://codereview.chromium.org/696733003/diff/1/sky/engine/core/frame/FrameH...
sky/engine/core/frame/FrameHost.h:71: ServiceProvider* services() const { return
m_services; }
Why poitner?

[abarth-chromium, 2014-10-31 17:54:10]

Committed patchset #1 (id:1) manually as
1c63e03d2a6a0894e3824ee3aad7da838f0ae10e (presubmit successful).