Don't cache suggestion or download thumbnails on low-memory devices.

Bug: 718925
Change-Id: Ie11a88d9864bf6e4a4e85f7dc15c4e4e01bb00fe
Reviewed-on: https://chromium-review.googlesource.com/574856Reviewed-by: Maria Khomenko <mariakhomenko@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488639}

chrome/android/java/src/org/chromium/chrome/browser/download/ui/ThumbnailProviderImpl.java

@@ -12,6 +12,7 @@ import android.support.v4.util.LruCache;
 import android.text.TextUtils;
 import android.util.Pair;
 
+import org.chromium.base.SysUtils;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.annotations.CalledByNative;
 
@@ -144,8 +145,10 @@ public class ThumbnailProviderImpl implements ThumbnailProvider {
 
             // We set the key pair to contain the required size instead of the minimal dimension so
             // that future fetches of this thumbnail can recognise the key in the cache.
-            getBitmapCache().put(Pair.create(filePath, mCurrentRequest.getIconSize()),
-                    Pair.create(bitmap, bitmap.getByteCount()));
+            if (!SysUtils.isLowEndDevice()) {
+                getBitmapCache().put(Pair.create(filePath, mCurrentRequest.getIconSize()),
+                        Pair.create(bitmap, bitmap.getByteCount()));
+            }
             mCurrentRequest.onThumbnailRetrieved(filePath, bitmap);
         }
 

chrome/android/java/src/org/chromium/chrome/browser/suggestions/SuggestionsBinder.java

@@ -25,6 +25,7 @@ import android.widget.TextView;
 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.Callback;
 import org.chromium.base.Promise;
+import org.chromium.base.SysUtils;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeFeatureList;
 import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation;
@@ -354,8 +355,12 @@ public class SuggestionsBinder {
                         mCapturedSuggestion.isArticle() ? ThumbnailUtils.OPTIONS_RECYCLE_INPUT : 0);
             }
 
-            // Store the bitmap to skip the download task next time we display this snippet.
-            mCapturedSuggestion.setThumbnailBitmap(mUiDelegate.getReferencePool().put(thumbnail));
+            // If the device has sufficient memory, store the bitmap to skip the download task
+            // next time we display this snippet.
+            if (!SysUtils.isLowEndDevice()) {
+                mCapturedSuggestion.setThumbnailBitmap(
+                        mUiDelegate.getReferencePool().put(thumbnail));
+            }
 
             // Check whether the suggestions currently displayed in the view holder is the same as
             // the suggestion whose thumbnail we have just fetched.