Allow constructing an EglBase from an existing shared EGLContext.

webrtc/sdk/android/api/org/webrtc/EglBase.java

Index: webrtc/sdk/android/api/org/webrtc/EglBase.java
diff --git a/webrtc/sdk/android/api/org/webrtc/EglBase.java b/webrtc/sdk/android/api/org/webrtc/EglBase.java
index 3e221c2f478d368cca0f1c3534dc15df8c55b740..9a2badeac4545f4f0f44175797026c87fc66ad7e 100644
--- a/webrtc/sdk/android/api/org/webrtc/EglBase.java
+++ b/webrtc/sdk/android/api/org/webrtc/EglBase.java
@@ -116,12 +116,30 @@ public abstract class EglBase {
   }
 
   /**
+   * Explicitly create a root EGl 1.0 context with the specified config attributes
+   * and shader context.

[magjed_webrtc, 2017/05/25 14:25:19]

nit: shared, not shader.

[Taylor Brandstetter, 2017/05/25 16:53:57]

Done; I saw "shaderContext" used in another place to refer to the EGLContext
itself, so I wasn't sure what the right term here was.

+   */
+  public static EglBase createEgl10(
+      javax.microedition.khronos.egl.EGLContext sharedContext, int[] configAttributes) {
+    return new EglBase10(new EglBase10.Context(sharedContext), configAttributes);
+  }
+
+  /**
    * Explicitly create a root EGl 1.4 context with the specified config attributes.
    */
   public static EglBase createEgl14(int[] configAttributes) {
     return new EglBase14(null /* shaderContext */, configAttributes);
   }
 
+  /**
+   * Explicitly create a root EGl 1.4 context with the specified config attributes
+   * and shader context.

[magjed_webrtc, 2017/05/25 14:25:19]

nit: shared, not shader.

+   */
+  public static EglBase createEgl14(
+      android.opengl.EGLContext sharedContext, int[] configAttributes) {
+    return new EglBase14(new EglBase14.Context(sharedContext), configAttributes);
+  }
+
   public abstract void createSurface(Surface surface);
 
   // Create EGLSurface from the Android SurfaceTexture.