Don't use modern snackbar on tablets

We use a narrow snackbar on tablets, so a different background asset is
needed to show shadows on all edges of the white snackbar.

For now, don't use the modern snackbar on tablets.

BUG=817518

Change-Id: I49bb4f6a14cf804e719d433db9f26192a52a9495
Reviewed-on: https://chromium-review.googlesource.com/941506Reviewed-by: Becky Zhou <huayinz@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539977}

chrome/android/java/src/org/chromium/chrome/browser/snackbar/SnackbarView.java

@@ -240,16 +240,13 @@ class SnackbarView {
         int backgroundColor = snackbar.getBackgroundColor();
         if (backgroundColor == 0) {
             backgroundColor = ApiCompatibilityUtils.getColor(mContainerView.getResources(),
-                    FeatureUtilities.isChromeModernDesignEnabled()
-                            ? R.color.modern_primary_color
-                            : R.color.snackbar_background_color);
+                    useModernDesign() ? R.color.modern_primary_color
+                                      : R.color.snackbar_background_color);
         }
 
         int textAppearanceResId = snackbar.getTextAppearance();
         if (textAppearanceResId == 0) {
-            textAppearanceResId = FeatureUtilities.isChromeModernDesignEnabled()
-                    ? R.style.BlackBodyDefault
-                    : R.style.WhiteBody;
+            textAppearanceResId = useModernDesign() ? R.style.BlackBodyDefault : R.style.WhiteBody;
         }
         ApiCompatibilityUtils.setTextAppearance(mMessageView, textAppearanceResId);
 
@@ -277,7 +274,7 @@ class SnackbarView {
             mProfileImageView.setVisibility(View.GONE);
         }
 
-        if (FeatureUtilities.isChromeModernDesignEnabled()) {
+        if (useModernDesign()) {
             mActionButtonView.setTextColor(ApiCompatibilityUtils.getColor(
                     mContainerView.getResources(), R.color.blue_when_enabled));
             mShadowView.setVisibility(View.VISIBLE);
@@ -324,4 +321,8 @@ class SnackbarView {
             view.setText(text);
         }
     }
+
+    private boolean useModernDesign() {
+        return !mIsTablet && FeatureUtilities.isChromeModernDesignEnabled();
+    }
 }