feat: Extend google_search support to Gemini 3 in Java ADK

PiperOrigin-RevId: 867697057

Author: google-genai-bot

core/src/main/java/com/google/adk/tools/GoogleSearchTool.java

@@ -28,8 +28,8 @@
 import org.slf4j.LoggerFactory;
 
 /**
- * A built-in tool that is automatically invoked by Gemini 2 models to retrieve search results from
- * Google Search.
+ * A built-in tool that is automatically invoked by Gemini 2 and 3 models to retrieve search results
+ * from Google Search.
  *
  * <p>This tool operates internally within the model and does not require or perform local code
  * execution.
@@ -76,7 +76,7 @@ public Completable processLlmRequest(
       updatedToolsBuilder.add(
           Tool.builder().googleSearchRetrieval(GoogleSearchRetrieval.builder().build()).build());
       configBuilder.tools(updatedToolsBuilder.build());
-    } else if (model != null && model.startsWith("gemini-2")) {
+    } else if (model != null && (model.startsWith("gemini-2") || model.startsWith("gemini-3"))) {
 
       updatedToolsBuilder.add(Tool.builder().googleSearch(GoogleSearch.builder().build()).build());
       configBuilder.tools(updatedToolsBuilder.build());