[Contextual Search] Add Mojo-enabled API component.

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 6ee72c4d7ddf173911a4f9a53bb5cd7cdf9612ab..d13e5f097b086fbbbd394bcc5ff02fb2e880ab8d 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
@@ -47,7 +47,6 @@ import org.chromium.content.browser.ContextualSearchClient;
 import org.chromium.content_public.browser.GestureStateListener;
 import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.content_public.browser.NavigationEntry;
-import org.chromium.content_public.browser.WebContentsObserver;
 import org.chromium.content_public.common.TopControlsState;
 import org.chromium.ui.base.WindowAndroid;
 
@@ -88,7 +87,6 @@ public class ContextualSearchManager extends ContextualSearchObservable
     private final ViewTreeObserver.OnGlobalFocusChangeListener mOnFocusChangeListener;
 
     private final WindowAndroid mWindowAndroid;
-    private WebContentsObserver mSearchWebContentsObserver;
     private ContextualSearchContentViewDelegate mSearchContentViewDelegate;
     private final ContextualSearchTabPromotionDelegate mTabPromotionDelegate;
     private TabModelSelectorTabObserver mTabModelSelectorTabObserver;
@@ -866,6 +864,12 @@ public class ContextualSearchManager extends ContextualSearchObservable
 
         @Override
         public void onContentViewCreated(ContentViewCore contentViewCore) {
+            if (mPolicy.shouldInjectJavaScript()) {

[pedro (no code reviews), 2015/10/20 01:24:41]

I think we should move this logic to the OverlayPanelContent class since we're
isolating all content related logic there (and that class has a native
component).

I would be okay for addressing this in a followup CL though. In this case,
please put a TODO here.

[Donn Denman, 2015/10/20 21:56:46]

Adding a TODO, for now.

+                // Enable a JavaScript communication channel between our service and the new view.
+                nativeEnableContextualSearchServiceForView(mNativeContextualSearchManagerPtr,
+                        contentViewCore);
+            }
+
             // TODO(mdjones): Move SearchContentViewDelegate ownership to panel.
             mSearchContentViewDelegate.setContextualSearchContentViewCore(contentViewCore);
         }
@@ -1228,4 +1232,6 @@ public class ContextualSearchManager extends ContextualSearchObservable
     private native void nativeGatherSurroundingText(long nativeContextualSearchManager,
             String selection, boolean useResolvedSearchTerm, ContentViewCore baseContentViewCore,
             boolean maySendBasePageUrl);
+    private native void nativeEnableContextualSearchServiceForView(
+            long nativeContextualSearchManager, ContentViewCore overlayContentViewCore);
 }