graphics: Clean up VTS boilerplate for composer

This CL makes the V2_1::vts::Composer class more reusable, and cleans up
the 2.2 boilerplate.

Bug: 74619554
Test: VtsHalGraphicsComposerV2_2TargetTest
Change-Id: Iff2905d40afe16a0b9ce735f1285d5bdc6b4cec7
diff --git a/graphics/composer/2.1/utils/vts/ComposerVts.cpp b/graphics/composer/2.1/utils/vts/ComposerVts.cpp
index 2f531b4..43a5378 100644
--- a/graphics/composer/2.1/utils/vts/ComposerVts.cpp
+++ b/graphics/composer/2.1/utils/vts/ComposerVts.cpp
@@ -25,21 +25,19 @@
 namespace V2_1 {
 namespace vts {
 
-Composer::Composer() {
-    mComposer = ::testing::VtsHalHidlTargetTestBase::getService<IComposer>();
-    init();
-}
+Composer::Composer() : Composer(::testing::VtsHalHidlTargetTestBase::getService<IComposer>()) {}
 
-Composer::Composer(const std::string& name) {
-    mComposer = ::testing::VtsHalHidlTargetTestBase::getService<IComposer>(name);
-    init();
-}
+Composer::Composer(const std::string& name)
+    : Composer(::testing::VtsHalHidlTargetTestBase::getService<IComposer>(name)) {}
 
-void Composer::init() {
-    ASSERT_NE(nullptr, mComposer.get()) << "failed to get composer service";
+Composer::Composer(const sp<IComposer>& composer) : mComposer(composer) {
+    // ASSERT_* can only be used in functions returning void.
+    [this] {
+        ASSERT_NE(nullptr, mComposer.get()) << "failed to get composer service";
 
-    std::vector<IComposer::Capability> capabilities = getCapabilities();
-    mCapabilities.insert(capabilities.begin(), capabilities.end());
+        std::vector<IComposer::Capability> capabilities = getCapabilities();
+        mCapabilities.insert(capabilities.begin(), capabilities.end());
+    }();
 }
 
 sp<IComposer> Composer::getRaw() const {
diff --git a/graphics/composer/2.1/utils/vts/include/composer-vts/2.1/ComposerVts.h b/graphics/composer/2.1/utils/vts/include/composer-vts/2.1/ComposerVts.h
index 8d5493e..c97be76 100644
--- a/graphics/composer/2.1/utils/vts/include/composer-vts/2.1/ComposerVts.h
+++ b/graphics/composer/2.1/utils/vts/include/composer-vts/2.1/ComposerVts.h
@@ -57,10 +57,10 @@
     std::unique_ptr<ComposerClient> createClient();
 
    protected:
-    sp<IComposer> mComposer;
+    explicit Composer(const sp<IComposer>& composer);
 
    private:
-    void init();
+    const sp<IComposer> mComposer;
 
     std::unordered_set<IComposer::Capability> mCapabilities;
 };
@@ -68,7 +68,7 @@
 // A wrapper to IComposerClient.
 class ComposerClient {
    public:
-    ComposerClient(const sp<IComposerClient>& client);
+    explicit ComposerClient(const sp<IComposerClient>& client);
     ~ComposerClient();
 
     sp<IComposerClient> getRaw() const;
@@ -116,7 +116,7 @@
     std::unordered_map<Display, DisplayResource> mDisplayResources;
 
    private:
-    sp<IComposerClient> mClient;
+    const sp<IComposerClient> mClient;
 };
 
 }  // namespace vts