Create the base Custom Context Menu Dialog.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/contextmenu/CustomContextMenuViewPager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/CustomContextMenuViewPager.java b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/CustomContextMenuViewPager.java
new file mode 100644
index 0000000000000000000000000000000000000000..1e9c682985fccb0f8aebfc826063a0106d8e2121
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/CustomContextMenuViewPager.java
@@ -0,0 +1,54 @@
+// 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 CustomContextMenuViewPager extends ViewPager {
+    public CustomContextMenuViewPager(Context context) {
+        super(context);
+    }
+
+    public CustomContextMenuViewPager(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    /** Used to show the full ViewPager dialog. Without this the dialog would have no height or

[David Trainor- moved to gerrit, 2017/03/21 16:30:03]

Fix javadoc?

[JJ, 2017/03/22 23:35:33]

Done.

+     * width.
+     */
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int maxHeight = 0;
+        int tabHeight = 0;
+        if (getChildCount() > 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) {
+                    tabHeight = measuredHeight;
+                } else {
+                    maxHeight = Math.max(maxHeight, child.getMeasuredHeight());
+                }
+            }
+        }
+        maxHeight += tabHeight;
+        heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.EXACTLY);
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+    }
+}