Photo Picker dialog: Fix single-selection bug.

chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerBitmapView.java

Index: chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerBitmapView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerBitmapView.java b/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerBitmapView.java
index 556087fc9bc10e07160b97caf124d56e4789f3f0..aa1a1db2e1d1609e02fd6e829e756b2553d68e38 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerBitmapView.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/photo_picker/PickerBitmapView.java
@@ -146,6 +146,13 @@ public class PickerBitmapView extends SelectableItemView<PickerBitmap> {
 
         boolean selected = selectedItems.contains(mBitmapDetails);
         boolean checked = super.isChecked();
+
+        // In single-selection mode, the list needs to be updated to account for items that were
+        // checked before but no longer are (because something else was selected).
+        if (!mCategoryView.isMultiSelectAllowed() && !selected && checked) {
+            super.toggle();
+        }

[Finnur, 2017/05/16 13:38:15]

This is a piece of code we discussed earlier and I removed because I couldn't
remember why  it was in there. Well... I do now, so I'm raising this from the
dead. :)

When single-selecting a photo, if you click on photo A and then on photo B,
photo A should stop being selected and that is what this code ensures.

+
         boolean needsResize = selected != checked;
         int size = selected && !checked ? mCategoryView.getImageSize() - 2 * mBorder
                                         : mCategoryView.getImageSize();