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Every invocation of Java method via an interface JS wrapper injected by Java bridge
is preceded by a call to GetNamedProperty. As method presence can't change
during Java object's lifetime, we should cache it on the renderer side, as every
IPC call to the browser side is super-expensive.

This optimization improves Cordova's "exec" benchmark speed by astonishing 60%, as
we shave off half of the IPC calls.

BUG=355644

Review URL: https://codereview.chromium.org/381683002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282345 0039d316-1c4b-4281-b951-d872f2087c98