Back out "[RN] Remove RCTUIImageViewAnimated WeakProxy gating"

Summary:
Original commit changeset: 91eb08181f82
Original diff: D16940181

The original commit removed the gating logic to enable the "fix" to T48583301. However, v236 was burned, and v237+ no longer had this gating, making it impossible to measure the impact of the fix.

This diff reverted the original gating removal until we confirm the fix in prod. Note: this is to be picked to RC v238 (but will have merge conflict for sure, will send a separate diff for the branch).

Reviewed By: mmmulani

Differential Revision: D17251340

fbshipit-source-id: 359ac54aeb9c9e728c2735c688346a1f79ed2189

Libraries/Image/RCTUIImageViewAnimated.h

@@ -8,6 +8,8 @@
 #import <React/RCTAnimatedImage.h>
 #import <React/RCTDefines.h>
 
+RCT_EXTERN void RCTUIImageViewEnableWeakProxy(BOOL enabled);
+
 @interface RCTUIImageViewAnimated : UIImageView
 
 @end

Libraries/Image/RCTUIImageViewAnimated.m

@@ -11,6 +11,11 @@
 #import <mach/mach.h>
 #import <objc/runtime.h>
 
+static BOOL weakProxyEnabled = YES;
+void RCTUIImageViewEnableWeakProxy(BOOL enabled) {
+  weakProxyEnabled = enabled;
+}
+
 static NSUInteger RCTDeviceTotalMemory() {
   return (NSUInteger)[[NSProcessInfo processInfo] physicalMemory];
 }
@@ -153,7 +158,9 @@ static NSUInteger RCTDeviceFreeMemory() {
   }
 
   if (!_displayLink) {
-    _displayLink = [CADisplayLink displayLinkWithTarget:[RCTWeakProxy weakProxyWithTarget:self] selector:@selector(displayDidRefresh:)];
+    __weak typeof(self) weakSelf = self;
+    id target = weakProxyEnabled ? [RCTWeakProxy weakProxyWithTarget:self] : weakSelf;
+    _displayLink = [CADisplayLink displayLinkWithTarget:target selector:@selector(displayDidRefresh:)];
     NSString *runLoopMode = [NSProcessInfo processInfo].activeProcessorCount > 1 ? NSRunLoopCommonModes : NSDefaultRunLoopMode;
     [_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:runLoopMode];
   }