[Webapps] Fix splash screen scaling on Android P

When loading splash_icon.xml on Android P, scaling doesn't occur until
after the image is drawn. As a result, if we try to show a lower DPI image
such as the mdpi icon, the Bitmap#getWidth/Bitmap#getHeight values will
only return the original image size on Android P. What we actually want is
the scaled image size. To do so we use
Bitmap#getScaledWidth/Bitmap#getScaledHeight which return the scaled image
size in pixels. This wasn't a problem on O and earlier since this scaling
occurred when the bitmap was loaded into memory (prior to rendering).

Bug: 819755
Change-Id: I86ad9466d653d4d8501a8c672925b2ba86819d8d
Reviewed-on: https://chromium-review.googlesource.com/1148815Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577987}

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappSplashScreenController.java

@@ -7,6 +7,7 @@ package org.chromium.chrome.browser.webapps;
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
+import android.util.DisplayMetrics;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -240,16 +241,19 @@ class WebappSplashScreenController extends EmptyTabObserver {
         int bigThreshold =
                 resources.getDimensionPixelSize(R.dimen.webapp_splash_image_size_threshold);
 
+        DisplayMetrics metrics =
+                ContextUtils.getApplicationContext().getResources().getDisplayMetrics();
+
         // Inflate the correct layout for the image.
         int layoutId;
-        if (displayIcon == null || displayIcon.getWidth() < minimiumSizeThreshold
+        if (displayIcon == null || displayIcon.getScaledWidth(metrics) < minimiumSizeThreshold
                 || (displayIcon == webappInfo.icon() && webappInfo.isIconGenerated())) {
             mWebappUma.recordSplashscreenIconType(WebappUma.SplashScreenIconType.NONE);
             layoutId = R.layout.webapp_splash_screen_no_icon;
         } else {
             // The size of the splash screen image determines which layout to use.
-            boolean isUsingSmallSplashImage = displayIcon.getWidth() <= bigThreshold
-                    || displayIcon.getHeight() <= bigThreshold;
+            boolean isUsingSmallSplashImage = displayIcon.getScaledWidth(metrics) <= bigThreshold
+                    || displayIcon.getScaledHeight(metrics) <= bigThreshold;
             if (isUsingSmallSplashImage) {
                 layoutId = R.layout.webapp_splash_screen_small;
             } else {