[TTS] Add onTouchDown to GestureStateListener.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/TapDurationSuppression.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/TapDurationSuppression.java b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/TapDurationSuppression.java
new file mode 100644
index 0000000000000000000000000000000000000000..3d7115362f767d71bf4867250d88c5792482e91c
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/TapDurationSuppression.java
@@ -0,0 +1,58 @@
+// 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;
+
+/**
+ * Provides a signal for the duration of a Tap being either brief or lengthy.
+ * This signal could be used for suppression of taps below some threshold, so we aggregate-log too.
+ * We log CTR to UMA for Taps shorter and longer than the threshold.
+ */
+class TapDurationSuppression extends ContextualSearchHeuristic {
+    private static final int DEFAULT_TAP_DURATION_THRESHOLD_MS = 70;
+
+    private final int mTapDurationMs;
+    private final int mTapDurationThresholdMs;
+    private final boolean mIsTapDurationConditionSatisfied;
+
+    /**
+     * Constructs a heuristic to categorize the Tap based on duration as either short or long.
+     * @param tapDurationMs The duration of the tap in milliseconds.
+     */
+    TapDurationSuppression(int tapDurationMs) {
+        mTapDurationMs = tapDurationMs;
+        mTapDurationThresholdMs = ContextualSearchFieldTrial.getTapDurationThresholdMs();
+        int tapDurationThreshold = mTapDurationThresholdMs != 0 ? mTapDurationThresholdMs
+                                                                : DEFAULT_TAP_DURATION_THRESHOLD_MS;
+        mIsTapDurationConditionSatisfied = tapDurationMs < tapDurationThreshold;
+    }
+
+    @Override
+    protected boolean isConditionSatisfiedAndEnabled() {
+        return mIsTapDurationConditionSatisfied && mTapDurationThresholdMs != 0;
+    }
+
+    @Override
+    protected void logResultsSeen(boolean wasSearchContentViewSeen, boolean wasActivatedByTap) {
+        if (wasActivatedByTap) {
+            ContextualSearchUma.logTapDurationSeen(
+                    wasSearchContentViewSeen, mIsTapDurationConditionSatisfied);
+
+            // TODO(donnd): remove when logging to Ranker is done!
+            ContextualSearchUma.logTapDuration(wasSearchContentViewSeen, mTapDurationMs);
+        }
+    }
+
+    // TODO(donnd): Log the actual tap duration to Ranker once we have privacy-approval!
+
+    @Override
+    protected boolean shouldAggregateLogForTapSuppression() {
+        return true;
+    }
+
+    @Override
+    protected boolean isConditionSatisfiedForAggregateLogging() {
+        return mIsTapDurationConditionSatisfied;
+    }
+}