Restore EGL_EXT_buffer_age for SwiftShader Vulkan

EGL_EXT_buffer_age was previously disabled for SwiftShader Vulkan
because of an Android test timing out on Cuttlefish when the buffer
age is queried. aosp/1672445 addresses the root cause of the timeout,
so EGL_EXT_buffer_age can be supported again.

Bug: b/182521420
Bug: angleproject:3529
Change-Id: I5949f721316855d9138eb9f657a6df4e7b49ed71
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2821750
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Nicolas Capens <nicolascapens@google.com>

include/platform/FeaturesVk.h

@@ -479,14 +479,6 @@ struct FeaturesVk : FeatureSetBase
         "supportsNegativeViewport", FeatureCategory::VulkanFeatures,
         "The driver supports inverting the viewport with a negative height.", &members};
 
-    // The EGL_EXT_buffer_age implementation causes
-    // android.graphics.cts.BitmapTest#testDrawingHardwareBitmapNotLeaking to fail on Cuttlefish
-    // with SwANGLE. Needs investigation whether this is a race condition which could affect other
-    // Vulkan drivers, or if it's a SwiftShader bug.
-    // http://anglebug.com/3529
-    Feature enableBufferAge = {"enableBufferAge", FeatureCategory::VulkanWorkarounds,
-                               "Expose EGL_EXT_buffer_age", &members, "http://anglebug.com/3529"};
-
     // Whether we should force any highp precision in the fragment shader to mediump.
     // ANGLE is non-conformant if this feature is enabled.
     Feature forceFragmentShaderPrecisionHighpToMediump = {

src/libANGLE/renderer/vulkan/DisplayVk.cpp

@@ -246,7 +246,7 @@ void DisplayVk::generateExtensions(egl::DisplayExtensions *outExtensions) const
     outExtensions->swapWithFrameToken  = getRenderer()->getFeatures().supportsGGPFrameToken.enabled;
 #endif  // defined(ANGLE_PLATFORM_GGP)
 
-    outExtensions->bufferAgeEXT = getRenderer()->getFeatures().enableBufferAge.enabled;
+    outExtensions->bufferAgeEXT = true;
 }
 
 void DisplayVk::generateCaps(egl::Caps *outCaps) const

src/libANGLE/renderer/vulkan/RendererVk.cpp

@@ -2353,13 +2353,6 @@ void RendererVk::initFeatures(DisplayVk *displayVk,
     ANGLE_FEATURE_CONDITION(&mFeatures, exposeNonConformantExtensionsAndVersions,
                             kExposeNonConformantExtensionsAndVersions);
 
-    // The EGL_EXT_buffer_age implementation causes
-    // android.graphics.cts.BitmapTest#testDrawingHardwareBitmapNotLeaking to fail on Cuttlefish
-    // with SwANGLE. Needs investigation whether this is a race condition which could affect other
-    // Vulkan drivers, or if it's a SwiftShader bug.
-    // http://anglebug.com/3529
-    ANGLE_FEATURE_CONDITION(&mFeatures, enableBufferAge, !isSwiftShader);
-
     // Disabled by default. Only enable it for experimental purpose, as this will cause various
     // tests to fail.
     ANGLE_FEATURE_CONDITION(&mFeatures, forceFragmentShaderPrecisionHighpToMediump, false);