[TTS] Add a Java Context linked to existing native

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

Index: chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchContext.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchContext.java b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchContext.java
new file mode 100644
index 0000000000000000000000000000000000000000..1ad2a6528e5087d7f6ce242986cf5256414961c9
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchContext.java
@@ -0,0 +1,77 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.contextualsearch;
+
+import org.chromium.base.annotations.CalledByNative;
+
+/**
+ * Provides a context in which to search, and links to the native ContextualSearchContext.
+ * Includes the selection, selection offsets, surrounding page content, etc.
+ */
+public class ContextualSearchContext {
+    // The initial selection that established this context, or null.
+    private final String mSelection;
+
+    // Pointer to the native instance of this class.
+    private long mNativePointer;
+
+    /**
+     * Constructs a context that cannot resolve a search term and has a small amount of
+     * page content.
+     */
+    ContextualSearchContext() {
+        mNativePointer = nativeInit();
+        mSelection = null;
+    }
+
+    /**
+     * Constructs a context that can resolve a search term and has a large amount of
+     * page content.
+     * @param selection The current selection.
+     * @param homeCountry The country where the user usually resides, or an empty string if not
+     *        known.
+     * @param maySendBasePageUrl Whether policy allows sending the base-page URL to the server.
+     */
+    ContextualSearchContext(String selection, String homeCountry, boolean maySendBasePageUrl) {
+        mNativePointer = nativeInit();
+        mSelection = selection;
+        nativeSetResolveProperties(getNativePointer(), selection, homeCountry, maySendBasePageUrl);
+    }
+
+    /**
+     * This method should be called to clean up storage when an instance of this class is
+     * no longer in use.  The nativeDestroy will call the destructor on the native instance.
+     */
+    void destroy() {
+        assert mNativePointer != 0;
+        nativeDestroy(mNativePointer);
+        mNativePointer = 0;
+    }
+
+    /**
+     * @return the original selection.
+     */
+    String getSelection() {
+        return mSelection;
+    }
+
+    // ============================================================================================
+    // Native callback support.
+    // ============================================================================================
+
+    @CalledByNative
+    private long getNativePointer() {
+        assert mNativePointer != 0;
+        return mNativePointer;
+    }
+
+    // ============================================================================================
+    // Native methods.
+    // ============================================================================================
+    private native long nativeInit();
+    private native void nativeDestroy(long nativeContextualSearchContext);
+    private native void nativeSetResolveProperties(long nativeContextualSearchContext,
+            String selection, String homeCountry, boolean maySendBasePageUrl);
+}