[Contextual Search] Use Mojo API for Quick Answers.

chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchManager.java b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchManager.java
index f4d41cb777e9a3d1112fdec2a48e220099f36bc4..54461ab0d40ee3af012314d2669cefe72d0ccf68 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchManager.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchManager.java
@@ -11,6 +11,7 @@ import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
 import android.view.ViewTreeObserver.OnGlobalFocusChangeListener;
 
+import org.chromium.base.Log;
 import org.chromium.base.SysUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
@@ -748,6 +749,20 @@ public class ContextualSearchManager extends ContextualSearchObservable
         return mPolicy.isTapSupported();
     }
 
+    /**
+     * Called by the page through the CS JavaScript API to notify CS that there is
+     * a caption available on the current overlay.
+     * @param caption The caption to display.
+     * @param doesAnswer Whether the caption should be regarded as an answer such
+     *        that the user may not need to open the panel, or whether the caption
+     *        is simply informative or descriptive of the answer in the full results.
+     */
+    @CalledByNative
+    private void onSetCaption(String caption, boolean doesAnswer) {
+        // TODO(donnd): notify the UX of the caption and log doesAnswer.
+        Log.i(TAG, "ctxs setCaption: '" + caption + "', " + doesAnswer);
+    }
+
     // ============================================================================================
     // Translation support
     // TODO(donnd): move to a separate file.
@@ -990,6 +1005,13 @@ public class ContextualSearchManager extends ContextualSearchObservable
 
         @Override
         public void onContentViewCreated(ContentViewCore contentViewCore) {
+            // TODO(donnd): Consider moving to OverlayPanelContent.
+            if (mPolicy.shouldEnableOverlayApi()) {
+                // Enable the Contextual Search JavaScript API between our service and the new view.
+                nativeAddViewForContextualSearchApi(
+                        mNativeContextualSearchManagerPtr, contentViewCore);
+            }
+
             // TODO(mdjones): Move SearchContentViewDelegate ownership to panel.
             mSearchContentViewDelegate.setOverlayPanelContentViewCore(contentViewCore);
         }
@@ -1343,4 +1365,6 @@ public class ContextualSearchManager extends ContextualSearchObservable
     // Don't call these directly, instead call the private methods that cache the results.
     private native String nativeGetTargetLanguage(long nativeContextualSearchManager);
     private native String nativeGetAcceptLanguages(long nativeContextualSearchManager);
+    private native void nativeAddViewForContextualSearchApi(
+            long nativeContextualSearchManager, ContentViewCore overlayContentViewCore);
 }