Photo Picker dialog: Request Storage permission if not already granted (e.g. through downloads).

ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java

Index: ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java
diff --git a/ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java b/ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java
index 753a559340d994f64956f794b4dcb295ea7ed12a..01bc4cd08b3d481022ec3b2f84391319666bf2c6 100644
--- a/ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java
+++ b/ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java
@@ -157,6 +157,10 @@ public class SelectFileDialog implements WindowAndroid.IntentCallback,
                 && !window.hasPermission(Manifest.permission.RECORD_AUDIO)) {
             missingPermissions.add(Manifest.permission.RECORD_AUDIO);
         }
+        if (UiUtils.shouldShowPhotoPicker()
+                && !window.hasPermission(Manifest.permission.READ_EXTERNAL_STORAGE)) {
+            missingPermissions.add(Manifest.permission.READ_EXTERNAL_STORAGE);
+        }
 
         if (missingPermissions.isEmpty()) {
             launchSelectFileIntent();