Create entry to PWSharing through ShareHelper

chrome/android/java/AndroidManifest.xml

Index: chrome/android/java/AndroidManifest.xml
diff --git a/chrome/android/java/AndroidManifest.xml b/chrome/android/java/AndroidManifest.xml
index c4933dbafb3e470e0372a1e995bdba04e4b6f8f7..286ac091f62e0cc3748e17b07dd6d0a85da12467 100644
--- a/chrome/android/java/AndroidManifest.xml
+++ b/chrome/android/java/AndroidManifest.xml
@@ -625,6 +625,23 @@ by a child template that "extends" this file.
             android:excludeFromRecents="true">
         </activity>
 
+        <!-- This activity is to expose the PhysicalWeb Share option via the generic Android share action. -->
+        <activity
+            android:name="org.chromium.chrome.browser.physicalweb.PhysicalWebShareActivity"
+            android:icon="@drawable/physical_web_notification_large"
+            android:label="@string/physical_web_share_activity_title"
+            android:enabled="false"
+            android:excludeFromRecents="true"
+            android:noHistory="true"
+            android:theme="@android:style/Theme.NoDisplay"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|mcc|mnc|screenLayout|smallestScreenSize" >
+            <intent-filter>
+                <action android:name="android.intent.action.SEND" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="text/plain" />
+            </intent-filter>
+        </activity>
+
         <!-- Service for handling Nearby Messages -->
         <service android:name="org.chromium.chrome.browser.physicalweb.NearbyMessageIntentService"
             android:exported="false" />