aw: Frame rate high for large webview

Adopt heuristic that large webview will remain high frame rate.
Note only-video case in a large webview will still request the
frame rate of video. But it does effectively break result of
setFrameContentVelocity for large webviews.

Bug: 346732738
Bug: b/376396847
Change-Id: I8b5a3507cc1d7472b1ff4a2ca70934bef98256a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6305945
Commit-Queue: Bo Liu <boliu@chromium.org>
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1425746}

android_webview/java/src/org/chromium/android_webview/AwContents.java

@@ -28,6 +28,7 @@ import android.os.Message;
 import android.os.SystemClock;
 import android.text.TextUtils;
 import android.util.Base64;
+import android.util.DisplayMetrics;
 import android.util.Pair;
 import android.util.SparseArray;
 import android.view.DragAndDropPermissions;
@@ -4333,6 +4334,8 @@ public class AwContents implements SmartClipProvider {
         private boolean mPreviouslyVisible;
         private String mPreviousScheme = "";
 
+        private boolean mSizeIsSmallForFrameRateHints;
+
         @SuppressLint("DrawAllocation") // For new AwFunctor.
         @Override
         public void onDraw(Canvas canvas) {
@@ -4363,7 +4366,10 @@ public class AwContents implements SmartClipProvider {
 
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.VANILLA_ICE_CREAM
                     && AwFeatureMap.isEnabled(VizFeatures.WEBVIEW_FRAME_RATE_HINTS)) {
-                float frame_rate = View.REQUESTED_FRAME_RATE_CATEGORY_DEFAULT;
+                float frame_rate =
+                        mSizeIsSmallForFrameRateHints
+                                ? View.REQUESTED_FRAME_RATE_CATEGORY_DEFAULT
+                                : View.REQUESTED_FRAME_RATE_CATEGORY_HIGH;
                 if (mPreferredFrameIntervalNanos > 0) {
                     frame_rate = (float) 1e9 / mPreferredFrameIntervalNanos;
                 }
@@ -4657,6 +4663,14 @@ public class AwContents implements SmartClipProvider {
         @Override
         public void onSizeChanged(int w, int h, int ow, int oh) {
             if (isDestroyed(NO_WARN)) return;
+
+            DisplayMetrics displayMetrics = mContext.getResources().getDisplayMetrics();
+            float pixelCount = (float) displayMetrics.widthPixels * displayMetrics.heightPixels;
+            float displayPixelCount = pixelCount == 0f ? Float.POSITIVE_INFINITY : pixelCount;
+            int viewPixelCount = w * h;
+            float ratio = viewPixelCount / displayPixelCount;
+            mSizeIsSmallForFrameRateHints = ratio < 0.5f;
+
             mScrollOffsetManager.setContainerViewSize(w, h);
             // The AwLayoutSizer needs to go first so that if we're in
             // fixedLayoutSize mode the update to enter fixedLayoutSize mode is sent before the