[Material][Mac] Fix for Bookmark Subfolders Hover State

chrome/browser/ui/cocoa/gradient_button_cell.mm

Index: chrome/browser/ui/cocoa/gradient_button_cell.mm
diff --git a/chrome/browser/ui/cocoa/gradient_button_cell.mm b/chrome/browser/ui/cocoa/gradient_button_cell.mm
index 796de611e89b7efbb4e8391c65bff47f5bfb68e0..cabd8cc6fec106710300f07faab3dfb962ba30f2 100644
--- a/chrome/browser/ui/cocoa/gradient_button_cell.mm
+++ b/chrome/browser/ui/cocoa/gradient_button_cell.mm
@@ -593,18 +593,25 @@ static const NSTimeInterval kAnimationContinuousCycleDuration = 0.4;
 
   // Stroke the borders and appropriate fill gradient. If we're borderless, the
   // only time we want to draw the inner gradient is if we're highlighted or if
-  // we're drawing the focus ring manually.
+  // we're drawing the focus ring manually. In Material Design, the "border" is
+  // actually a highlight, which should be drawn if
+  // |showsBorderOnlyWhileMouseInside| is true.
+  BOOL hasMaterialHighlight =
+      [self tag] == kMaterialStandardButtonTypeWithLimitedClickFeedback &&
+      ![self showsBorderOnlyWhileMouseInside];
   if (([self isBordered] && ![self showsBorderOnlyWhileMouseInside]) ||
-      pressed || [self isMouseInside] || [self isContinuousPulsing]) {
+      pressed || [self isMouseInside] || [self isContinuousPulsing] ||
+      hasMaterialHighlight) {
     // When pulsing we want the bookmark to stand out a little more.
     BOOL showClickedGradient = pressed ||
         (pulseState_ == gradient_button_cell::kPulsingContinuous);
+    BOOL showHighlightGradient = [self isHighlighted] || hasMaterialHighlight;
 
     [self drawBorderAndFillForTheme:themeProvider
                         controlView:controlView
                           innerPath:innerPath
                 showClickedGradient:showClickedGradient
-              showHighlightGradient:[self isHighlighted]
+              showHighlightGradient:showHighlightGradient
                          hoverAlpha:[self hoverAlpha]
                              active:active
                           cellFrame:cellFrame