[blimp] Add support for having multiple tabs

blimp/client/core/compositor/blimp_compositor_manager_unittest.cc

Index: blimp/client/core/compositor/blimp_compositor_manager_unittest.cc
diff --git a/blimp/client/core/compositor/blimp_compositor_manager_unittest.cc b/blimp/client/core/compositor/blimp_compositor_manager_unittest.cc
index cd8b63fb9e252dfe6796bf4ba1e930410c0a3f8d..5a054720a11769c4cfd4e70d3edb8f4c2b7c3619 100644
--- a/blimp/client/core/compositor/blimp_compositor_manager_unittest.cc
+++ b/blimp/client/core/compositor/blimp_compositor_manager_unittest.cc
@@ -22,6 +22,8 @@ namespace blimp {
 namespace client {
 namespace {
 
+const int kDummyBlimpContentsId = 0;
+
 class MockRenderWidgetFeature : public RenderWidgetFeature {
  public:
   MOCK_METHOD3(SendCompositorMessage,
@@ -54,10 +56,12 @@ class MockBlimpCompositor : public BlimpCompositor {
 class BlimpCompositorManagerForTesting : public BlimpCompositorManager {
  public:
   explicit BlimpCompositorManagerForTesting(
+      int blimp_contents_id,
       RenderWidgetFeature* render_widget_feature,
       BlimpCompositorDependencies* compositor_dependencies)
-      : BlimpCompositorManager(render_widget_feature, compositor_dependencies) {
-  }
+      : BlimpCompositorManager(blimp_contents_id,
+                               render_widget_feature,
+                               compositor_dependencies) {}
 
   using BlimpCompositorManager::GetCompositor;
 
@@ -80,7 +84,8 @@ class BlimpCompositorManagerTest : public testing::Test {
         base::MakeUnique<MockCompositorDependencies>());
 
     compositor_manager_ = base::MakeUnique<BlimpCompositorManagerForTesting>(
-        &render_widget_feature_, compositor_dependencies_.get());
+        kDummyBlimpContentsId, &render_widget_feature_,
+        compositor_dependencies_.get());
   }
 
   void TearDown() override {