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gles2_interface.h defines a pure virtual interface; targets which use it should
depend on it, but not necessarily on an implementation target. Consequently,
a //gpu/command_buffer/client:gles2_interface target was created to reflect the
dependency on this interface without linking a particular implementation.

This resolves an issue with //cc trying to use this header without having a
dependency on a target which includes it.

Review URL: https://codereview.chromium.org/464153002

Cr-Commit-Position: refs/heads/master@{#294956}