aw: Workaround qualcomm driver bug

android_webview/browser/scoped_app_gl_state_restore.cc

Index: android_webview/browser/scoped_app_gl_state_restore.cc
diff --git a/android_webview/browser/scoped_app_gl_state_restore.cc b/android_webview/browser/scoped_app_gl_state_restore.cc
index 43bd8aa142cdc728c15cea4d4821f07f44a89b00..2fa1b11ed81b18f1fbfb7db07128502d9171c06f 100644
--- a/android_webview/browser/scoped_app_gl_state_restore.cc
+++ b/android_webview/browser/scoped_app_gl_state_restore.cc
@@ -294,6 +294,9 @@ ScopedAppGLStateRestoreImpl::ScopedAppGLStateRestoreImpl(
     glGetVertexAttribfv(
         i, GL_CURRENT_VERTEX_ATTRIB, vertex_attrib_[i].current_vertex_attrib);
   }
+
+  // Android 5.0.0 specific qualcomm workaround. See crbug.com/434570.
+  glBindRenderbufferEXT(GL_RENDERBUFFER, 0);
   DCHECK(ClearGLErrors(false, NULL));
 }