8226384: Implement a better logic to switch between OpenGL and Metal pipeline

[jayathirthrao]

This PR tries to remove lot of CGraphicsDevice.usingMetalPipeline() ifelse checks that are used to determine which CALayer to be used in classes like CPlatformView and CPlatformEmbeddedFrame. At other places where we use GraphicsDevice.usingMetalPipeline() is for initialization.

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Progress

• [x] Change must not contain extraneous whitespace

Issue

• JDK-8226384: Implement a better logic to switch between OpenGL and Metal pipeline

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$ git fetch https://git.openjdk.java.net/lanai pull/183/head:pull/183 $ git checkout pull/183

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@jayathirthrao This change now passes all automated pre-integration checks.

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8226384: Implement a better logic to switch between OpenGL and Metal pipeline

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At the time when this comment was updated there had been 1 new commit pushed to the master branch:

• addfb6a977c03b8ae29e057bd18165a67b0e0278: 8261143: Code in MTLGraphicsConfig.m can use ThreadUtilities performOnMainThreadWaiting:YES block:^()

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