Add the ANGLEPlatform entry points to eglGetProcAddress We want to move the Chromium initialization of the ANGLE platform from being Windows-specific to being EGL-specific. Because the mechanisms by which the ANGLE library is loaded are OS-specific, it is inconvenient to use dlsym and friends to get the ANGLEPlatform entry points. Instead we expose the through eglGetProcAddress which is readily available in the EGL-specific part of Chromium. BUG=angleproject:1621 Change-Id: I7adbea003103d0331ec9eece7b881e27bd6b1a5d Reviewed-on: https://chromium-review.googlesource.com/410063 Commit-Queue: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>