Add a BrowserViewRenderer unittest for compositor switch logic

content/public/test/test_synchronous_compositor_android.cc

Index: content/public/test/test_synchronous_compositor_android.cc
diff --git a/content/public/test/test_synchronous_compositor_android.cc b/content/public/test/test_synchronous_compositor_android.cc
index 7f9bd2359b6402096882db250c11a7ae07065f0f..97b68c8d9e81bc671671f6f4f0b9f6e73e4c4e6f 100644
--- a/content/public/test/test_synchronous_compositor_android.cc
+++ b/content/public/test/test_synchronous_compositor_android.cc
@@ -10,20 +10,21 @@
 
 namespace content {
 
-TestSynchronousCompositor::TestSynchronousCompositor() : client_(NULL) {
-}
+TestSynchronousCompositor::TestSynchronousCompositor(int process_id,
+                                                     int routing_id)
+    : client_(NULL), process_id_(process_id), routing_id_(routing_id) {}
 
 TestSynchronousCompositor::~TestSynchronousCompositor() {
   SetClient(NULL);
 }
 
 void TestSynchronousCompositor::SetClient(SynchronousCompositorClient* client) {
-  if (client_)
-    client_->DidDestroyCompositor(this, 0, 0);
-  client_ = client;
   if (client_) {

[boliu, 2016/06/21 22:06:24]

nit: no need for braces

[hush (inactive), 2016/06/21 22:11:33]

Done.

-    client_->DidInitializeCompositor(this, 0, 0);
+    client_->DidDestroyCompositor(this, process_id_, routing_id_);
   }
+  client_ = client;
+  if (client_)
+    client_->DidInitializeCompositor(this, process_id_, routing_id_);
 }
 
 SynchronousCompositor::Frame TestSynchronousCompositor::DemandDrawHw(