Improve log message.

Add more information to the failure message: now it looks something like `Failed to get a callback for Display 0 switching from {Config 38: vsyncPeriod 4166666, minFrameIntervalNs 16666667} to {Config 37: vsyncPeriod 8333333, minFrameIntervalNs 8333333}` instead of `failed to get a callback for the display 0 with config 37`

Test: atest VtsHalGraphicsComposer3_TargetTest:PerInstance/GraphicsComposerAidlCommandV2Test#SetRefreshRateChangedCallbackDebugEnabled_SetActiveConfigWithConstraints/0_android_hardware_graphics_composer3_IComposer_default

Bug: 340971724
Change-Id: Id2a1030a9b12e86bda8f6031e79a8374227f4061
diff --git a/graphics/composer/aidl/vts/VtsComposerClient.h b/graphics/composer/aidl/vts/VtsComposerClient.h
index d3842c5..da6116f 100644
--- a/graphics/composer/aidl/vts/VtsComposerClient.h
+++ b/graphics/composer/aidl/vts/VtsComposerClient.h
@@ -288,6 +288,20 @@
         return false;
     }
 
+    std::string printConfig(int config) {
+        const auto displayConfig = getDisplayConfig(config);
+        const auto vrrConfigOpt = displayConfig.vrrConfigOpt;
+        std::stringstream ss;
+        if (displayConfig.vrrConfigOpt) {
+            ss << "{Config " << config << ": vsyncPeriod " << displayConfig.vsyncPeriod
+                << ", minFrameIntervalNs " << vrrConfigOpt->minFrameIntervalNs << "}";
+        }
+        else {
+            ss << "{Config " << config << ": vsyncPeriod " << displayConfig.vsyncPeriod << "}";
+        }
+        return ss.str();
+    }
+
     std::unordered_map<int32_t, DisplayConfig> getDisplayConfigs() { return mDisplayConfigs; }
 
   private:
diff --git a/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp b/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
index 0227e39..ba15421 100644
--- a/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
+++ b/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
@@ -2877,8 +2877,9 @@
             } while (--retryCount > 0);
 
             if (retryCount == 0) {
-                GTEST_FAIL() << "failed to get a callback for the display " << displayId
-                             << " with config " << config2;
+                GTEST_FAIL() << "Failed to get a callback for Display " << displayId
+                             << " switching from " << display.printConfig(config1)
+                             << " to " << display.printConfig(config2);
             }
         });