Create the base Custom Context Menu Dialog.

chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuViewPager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuViewPager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuViewPager.java b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuViewPager.java
new file mode 100644
index 0000000000000000000000000000000000000000..640aabe91a27fc70069f04302a0b1facb4ccb1db
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/TabularContextMenuViewPager.java
@@ -0,0 +1,53 @@
+// 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.contextmenu;
+
+import android.content.Context;
+import android.support.v4.view.ViewPager;
+import android.util.AttributeSet;
+import android.view.View;
+
+import org.chromium.chrome.R;
+
+/**
+ * When there is more than one view for the context menu to display, it wraps the display in a view
+ * pager.
+ */
+public class TabularContextMenuViewPager extends ViewPager {
+    public TabularContextMenuViewPager(Context context) {
+        super(context);
+    }
+
+    public TabularContextMenuViewPager(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    /**
+     * Used to show the full ViewPager dialog. Without this the dialog would have no height or
+     * width.
+     */
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int maxHeight = 0;
+        int tabHeight = 0;
+        for (int i = 0; i < getChildCount(); i++) {
+            View child = getChildAt(i);
+            child.measure(widthMeasureSpec,
+                    MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.UNSPECIFIED));
+            int measuredHeight = child.getMeasuredHeight();
+
+            // The ViewPager also considers the tab layout one of its children, and needs to be
+            // treated separately from getting the largest height.
+            if (child.getId() == R.id.tab_layout && child.getVisibility() != GONE) {
+                tabHeight = measuredHeight;
+            } else {
+                maxHeight = Math.max(maxHeight, child.getMeasuredHeight());
+            }
+        }
+        maxHeight += tabHeight;
+        heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.EXACTLY);
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+    }
+}