Index: content/browser/renderer_host/compositor_impl_android.cc |
diff --git a/content/browser/renderer_host/compositor_impl_android.cc b/content/browser/renderer_host/compositor_impl_android.cc |
index 032239f506d355024d1abcbbaaac0c30bc45ea85..5bb81c420a5eb645a20963c1a9662a28c9cef227 100644 |
--- a/content/browser/renderer_host/compositor_impl_android.cc |
+++ b/content/browser/renderer_host/compositor_impl_android.cc |
@@ -175,6 +175,12 @@ gpu::gles2::ContextCreationAttribHelper GetCompositorContextAttributes( |
// specified |
// (IOW check that a <= 0 && rgb > 0 && rgb <= 565) then alpha should be |
// -1. |
+ // TODO(liberato): This condition is memorized in ComositorView.java, to |
+ // avoid using two surfaces temporarily during alpha <-> no alpha |
+ // transitions. If these mismatch, then we risk a power regression if the |
+ // SurfaceView is not marked as eOpaque (FORMAT_OPAQUE), and we have an |
+ // EGL surface with an alpha channel. SurfaceFlinger needs at least one of |
+ // those hints to optimize out alpha blending. |
attributes.alpha_size = 0; |
attributes.red_size = 5; |
attributes.green_size = 6; |