Android: Add SurfaceTextureHelper for creating and managing SurfaceTextures

talk/app/webrtc/java/android/org/webrtc/EglBase.java

Index: talk/app/webrtc/java/android/org/webrtc/EglBase.java
diff --git a/talk/app/webrtc/java/android/org/webrtc/EglBase.java b/talk/app/webrtc/java/android/org/webrtc/EglBase.java
index 8d2c808cb256c5239d638ed5b6206b370d70cad9..20af8ecc75587cd80dfc8dd7f152a326e0e0a86e 100644
--- a/talk/app/webrtc/java/android/org/webrtc/EglBase.java
+++ b/talk/app/webrtc/java/android/org/webrtc/EglBase.java
@@ -156,9 +156,7 @@ public final class EglBase {
   public void release() {
     checkIsNotReleased();
     releaseSurface();
-    // Release our context.
-    EGL14.eglMakeCurrent(
-        eglDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT);
+    detachCurrent();
     EGL14.eglDestroyContext(eglDisplay, eglContext);
     EGL14.eglReleaseThread();
     EGL14.eglTerminate(eglDisplay);
@@ -177,6 +175,14 @@ public final class EglBase {
     }
   }
 
+  // Detach the current EGL context, so that it can be made current on another thread.
+  public void detachCurrent() {
+    if (!EGL14.eglMakeCurrent(
+        eglDisplay, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT)) {
+      throw new RuntimeException("eglMakeCurrent failed");
+    }
+  }
+
   public void swapBuffers() {
     checkIsNotReleased();
     if (eglSurface == EGL14.EGL_NO_SURFACE) {