When creating a new interceptor, we are given a target interface whose IID we already know. The current interceptor implementation ignores this fact and goes off and does an extra QI to resolve the interface, even though we already have one! I've written a patch that gives us a fast path for interceptor instantiation.
https://hg.mozilla.org/integration/mozilla-inbound/rev/3f6e08c5233f6a98703c85b3fc0b0e833fb9696b Bug 1367885: Add a fast path to mscom Interceptor construction; r=jimm
https://hg.mozilla.org/integration/mozilla-inbound/rev/fc854def3953aed24632eb910aa568702d67a522 Bug 1367885: Follow-up - fix missing explicit keyword on constructor on a CLOSED TREE; r=bustage
https://hg.mozilla.org/integration/mozilla-inbound/rev/ab4ef8ca799e413049ff66c26328f409b15eb223 Bug 1367885: Backed out changeset 3f6e08c5233f for bc4 bustage on a CLOSED TREE; r=backout
Bugherder got confused because the backout only mentioned one of the commit hashes, so it thought the other one was enough to fix the bug.
https://hg.mozilla.org/integration/mozilla-inbound/rev/09894b9ce473f681e86dfaf59ef4286c131ae669 Bug 1367885: Add a fast path to mscom Interceptor construction; r=jimm
https://hg.mozilla.org/integration/mozilla-inbound/rev/6fd10955e89903caf8f92e2c600aa2aa4a2be496 Bug 1367885: Follow-up - remove code that mistakenly landed as part of commit 09894b9ce473; r=backout
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