Add "Paste as plain text" into text selection toolbar overflow

content/public/android/java/src/org/chromium/content/browser/SelectionPopupController.java

Index: content/public/android/java/src/org/chromium/content/browser/SelectionPopupController.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/SelectionPopupController.java b/content/public/android/java/src/org/chromium/content/browser/SelectionPopupController.java
index df436286db9f02491051f09dbb0e97f44afb2607..286f8ef9bb8f05557e58062f63f9b3851300990a 100644
--- a/content/public/android/java/src/org/chromium/content/browser/SelectionPopupController.java
+++ b/content/public/android/java/src/org/chromium/content/browser/SelectionPopupController.java
@@ -7,6 +7,8 @@ package org.chromium.content.browser;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.SearchManager;
+import android.content.ClipData;
+import android.content.ClipDescription;
 import android.content.ClipboardManager;
 import android.content.Context;
 import android.content.Intent;
@@ -16,7 +18,11 @@ import android.content.res.Resources;
 import android.graphics.Rect;
 import android.os.Build;
 import android.provider.Browser;
+import android.text.Spanned;
 import android.text.TextUtils;
+import android.text.style.CharacterStyle;
+import android.text.style.ParagraphStyle;
+import android.text.style.UpdateAppearance;
 import android.view.ActionMode;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -107,6 +113,7 @@ public class SelectionPopupController extends ActionModeCallbackHelper {
     private boolean mIsPasswordType;
     private boolean mIsInsertion;
     private boolean mCanSelectAllForPastePopup;
+    private boolean mCanEditRichlyForPastePopup;
 
     private boolean mUnselectAllOnDismiss;
     private String mLastSelectedText;
@@ -261,7 +268,7 @@ public class SelectionPopupController extends ActionModeCallbackHelper {
         return actionMode;
     }
 
-    void createAndShowPastePopup(int x, int y, boolean canSelectAll) {
+    void createAndShowPastePopup(int x, int y, boolean canSelectAll, boolean canEditRichly) {
         if (mView.getParent() == null || mView.getVisibility() != View.VISIBLE) {
             return;
         }
@@ -269,6 +276,7 @@ public class SelectionPopupController extends ActionModeCallbackHelper {
         if (!supportsFloatingActionMode() && !canPaste()) return;
         destroyPastePopup();
         mCanSelectAllForPastePopup = canSelectAll;
+        mCanEditRichlyForPastePopup = canEditRichly;
         PastePopupMenuDelegate delegate = new PastePopupMenuDelegate() {
             @Override
             public void paste() {
@@ -277,6 +285,12 @@ public class SelectionPopupController extends ActionModeCallbackHelper {
             }
 
             @Override
+            public void pasteAsPlainText() {
+                mWebContents.pasteAsPlainText();
+                mWebContents.dismissTextHandles();
+            }
+
+            @Override
             public boolean canPaste() {
                 return SelectionPopupController.this.canPaste();
             }
@@ -290,6 +304,11 @@ public class SelectionPopupController extends ActionModeCallbackHelper {
             public boolean canSelectAll() {
                 return SelectionPopupController.this.canSelectAll();
             }
+
+            @Override
+            public boolean canPasteAsPlainText() {
+                return SelectionPopupController.this.canPasteAsPlainText();
+            }
         };
         Context windowContext = mWindowAndroid.getContext().get();
         if (windowContext == null) return;
@@ -509,6 +528,40 @@ public class SelectionPopupController extends ActionModeCallbackHelper {
         return clipMgr.hasPrimaryClip();
     }
 
+    // TODO(ctzsm): Remove this method after Android API is updated

[aelias_OOO_until_Jul13, 2017/05/01 23:25:41]

In reality, we will have to always keep this method unless we drop support for O
pre-MR1, so please remove the TODO.

[aelias_OOO_until_Jul13, 2017/05/01 23:25:41]

The likely reality is that we'll keep this code forever, so please remove the
TODO.  Even if added in O MR1, we still need this code to be present for O <MR1.

[Shimi Zhang, 2017/05/02 00:17:45]

Done.

[Shimi Zhang, 2017/05/02 00:17:46]

Done.

+    // Only check those classes affect appearance.
+    private boolean hasStyleSpan(Spanned spanned) {
+        Class<?>[] styleClasses = {
+                CharacterStyle.class, ParagraphStyle.class, UpdateAppearance.class};
+        for (Class<?> clazz : styleClasses) {
+            if (spanned.nextSpanTransition(-1, spanned.length(), clazz) < spanned.length()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    // if need to show paste as plain text.
+    @VisibleForTesting
+    public boolean canPasteAsPlainText() {
+        if (!BuildInfo.isAtLeastO()) return false;
+        if (!mCanEditRichlyForPastePopup) return false;
+        ClipboardManager clipMgr =
+                (ClipboardManager) mContext.getSystemService(Context.CLIPBOARD_SERVICE);
+        if (!clipMgr.hasPrimaryClip()) return false;
+
+        // In case that plain text is a Spanned.
+        ClipData clipData = clipMgr.getPrimaryClip();
+        ClipDescription description = clipData.getDescription();
+        CharSequence text = clipData.getItemAt(0).getText();
+        boolean isPlainType = description.hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN);
+        if (isPlainType && (text instanceof Spanned)) {
+            Spanned spanned = (Spanned) text;
+            if (hasStyleSpan(spanned)) return true;
+        }
+        return description.hasMimeType(ClipDescription.MIMETYPE_TEXT_HTML);
+    }
+
     private void updateAssistMenuItem(MenuDescriptor descriptor) {
         // There is no Assist functionality before Android O.
         if (!BuildInfo.isAtLeastO() || mAssistMenuItemId == 0) return;
@@ -696,6 +749,14 @@ public class SelectionPopupController extends ActionModeCallbackHelper {
     }
 
     /**
+     * Perform a paste as plain text action.
+     */
+    @VisibleForTesting
+    void pasteAsPlainText() {
+        mWebContents.pasteAsPlainText();
+    }
+
+    /**
      * Perform a share action.
      */
     @VisibleForTesting