gpu: reference target surfaces through a globally unique surface id.

chrome/browser/tab_contents/thumbnail_generator_unittest.cc

Index: chrome/browser/tab_contents/thumbnail_generator_unittest.cc
diff --git a/chrome/browser/tab_contents/thumbnail_generator_unittest.cc b/chrome/browser/tab_contents/thumbnail_generator_unittest.cc
index fc2ac3d5325effe75567388458d6e719f6cb5e23..6f535401207aea645f239b6e136de06e13bfad76 100644
--- a/chrome/browser/tab_contents/thumbnail_generator_unittest.cc
+++ b/chrome/browser/tab_contents/thumbnail_generator_unittest.cc
@@ -60,7 +60,7 @@ class ThumbnailGeneratorTest : public testing::Test {
   ThumbnailGeneratorTest() {
     profile_.reset(new TestingProfile());
     process_ = new MockRenderProcessHost(profile_.get());
-    widget_.reset(new RenderWidgetHost(process_, 1));
+    widget_.reset(new RenderWidgetHost(process_, MSG_ROUTING_NONE));
     view_.reset(new TestRenderWidgetHostViewWithBackingStoreSkia(
         widget_.get()));
     // Paiting will be skipped if there's no view.