Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/gsa/GSAState.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/gsa/GSAState.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/gsa/GSAState.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/gsa/GSAState.java
new file mode 100644
index 0000000000000000000000000000000000000000..e7b483e93bde906961d856d4e4d3dfdd27d21f3c
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+++ b/chrome/android/java_staging/src/org/chromium/chrome/browser/gsa/GSAState.java
@@ -0,0 +1,126 @@
+// Copyright 2015 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.gsa;
+
+import android.accounts.Account;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.text.TextUtils;
+
+import org.chromium.base.PackageUtils;
+import org.chromium.sync.signin.ChromeSigninController;
+
+/**
+ * A class responsible fore representing the current state of Chrome's integration with GSA.
+ */
+public class GSAState {
+    private static final int GSA_VERSION_FOR_DOCUMENT = 300401021;
+    private static final int GMS_CORE_VERSION = 6577010;
+
+    static final String SEARCH_INTENT_PACKAGE = "com.google.android.googlequicksearchbox";
+    private static final String GMS_CORE_PACKAGE = "com.google.android.gms";
+
+    static final String SEARCH_INTENT_ACTION =
+            "com.google.android.googlequicksearchbox.TEXT_ASSIST";
+
+    /**
+     * An instance of GSAState class encapsulating knowledge about the current status.
+     */
+    private static GSAState sGSAState;
+
+    /**
+     * The application context to use.
+     */
+    private final Context mContext;
+
+    /**
+     * Caches the result of a computation on whether GSA is available.
+     */
+    private Boolean mGsaAvailable;
+
+    /**
+     * The Google account being used by GSA according to the latest update we have received.
+     * This may be null.
+     */
+    private String mGsaAccount;
+
+    /**
+     * Returns the singleton instance of GSAState and creates one if necessary.
+     * @param context The context to use.
+     * @return The state object.
+     */
+    public static GSAState getInstance(Context context) {
+        if (sGSAState == null) {
+            sGSAState = new GSAState(context);
+        }
+        return sGSAState;
+    }
+
+    /* Private constructor, since this is a singleton */
+    private GSAState(Context context) {
+        mContext = context.getApplicationContext();
+    }
+
+    /**
+     * Update the GSA logged in account name and whether we are in GSA holdback.
+     * @param gsaAccount The email address of the logged in account.
+     */
+    public void setGsaAccount(String gsaAccount) {
+        mGsaAccount = gsaAccount;
+    }
+
+    /**
+     * @return Whether GSA and Chrome are logged in with the same account. The situation where
+     * both are logged out is not considered a match.
+     */
+    public boolean doesGsaAccountMatchChrome() {
+        Account chromeUser = ChromeSigninController.get(mContext).getSignedInUser();
+        return chromeUser != null && !TextUtils.isEmpty(mGsaAccount) && TextUtils.equals(
+                chromeUser.name, mGsaAccount);
+    }
+
+    /**
+     * @return The current GSA account. May return null if GSA hasn't replied yet.
+     */
+    public String getGsaAccount() {
+        return mGsaAccount;
+    }
+
+    /**
+     * This is used to check whether GSA package is available to handle search requests and if
+     * the Chrome experiment to do so is enabled.
+     * @return Whether the search intent this class creates will resolve to an activity.
+     */
+    public boolean isGsaAvailable() {
+        if (mGsaAvailable != null) return mGsaAvailable;
+        mGsaAvailable = false;
+        PackageManager pm = mContext.getPackageManager();
+        Intent searchIntent = new Intent(SEARCH_INTENT_ACTION);
+        searchIntent.setPackage(GSAState.SEARCH_INTENT_PACKAGE);
+        ResolveInfo resolveInfo = pm.resolveActivity(searchIntent, 0);
+        if (resolveInfo == null || resolveInfo.activityInfo == null) {
+            mGsaAvailable = false;
+        } else if (!isPackageAboveVersion(SEARCH_INTENT_PACKAGE, GSA_VERSION_FOR_DOCUMENT)
+                || !isPackageAboveVersion(GMS_CORE_PACKAGE, GMS_CORE_VERSION)) {
+            mGsaAvailable = false;
+        } else {
+            mGsaAvailable = true;
+        }
+        return mGsaAvailable;
+    }
+
+    /**
+     * Check whether the given package meets min requirements for using full document mode.
+     * @param packageName The package name we are inquiring about.
+     * @param minVersion The minimum version for the package to be.
+     * @return Whether the package exists on the device and its version is higher than the minimum
+     *         required version.
+     */
+    private boolean isPackageAboveVersion(String packageName, int minVersion) {
+        return PackageUtils.getPackageVersion(mContext, packageName) >= minVersion;
+    }
+}