Symbol-layer UBO allocation crashes WebGL context on mid-range mobile GPUs (Pixel 8a / Mali-G715) — regression in 3.21

### mapbox-gl-js version 3.21.0 (also 3.22.x). Works correctly in 3.19.1. ### Browser and version Chrome 141.0.7390.x on Android 15 (Pixel 8a, Mali-G715 MP7). ### Expected behavior A map using mapbox://styles/mapbox/streets-v12 should render on a current-generation mid-range mobile GPU (Pixel 8a) without exhausting the WebGL UBO budget. Ideally either: (a) UBO allocations chunk across draw calls so they fit within the device's GL_MAX_UNIFORM_BLOCK_SIZE / GL_MAX_UNIFORM_BUFFER_BINDINGS limits, or (b) a config option (e.g. Map#setUseUBO(false)) allows apps to opt back into the pre-3.21 attribute-based symbol path on constrained hardware. ### Actual behavior Tab hard-crashes ("Aw, Snap!") within ~2 seconds of first paint. The WebGL context is lost and Chrome kills the renderer. All symbol layers in the style are affected — the crash is triggered by the populateUBO call path added in 3.21. Before the crash, "Image 'X' could not be loaded" warnings appear for any custom symbol icon, because addImage callbacks never resolve — they are pre-empted by the UBO allocation failure on the same frame. The 3.21.0 changelog identifies the relevant change: - Improve symbol layer rendering performance (by adopting Uniform Buffer Objects for data-driven properties). Downgrading to 3.19.1 resolves the crash with no other code changes. ### Link to the demonstration https://jsbin.com/fupadolaxi/edit?html,output ### Steps to trigger the unexpected behavior 1. Open the JSBin link above on a Pixel 8a (or any mid-range Android with a Mali-G715). 2. Observe map painting for ~1-2 seconds. 3. Tab crashes with "Aw, Snap!" To confirm the regression is in 3.21: edit the JSBin, replace both occurrences of "v3.21.0" with "v3.19.1", save, and reload on the same device — the map renders and stays rendered. Desktop browsers (Chrome / Firefox / Safari on Mac or Linux) do not reproduce the crash because desktop GPUs have a far larger UBO budget. ### Relevant log output ```shell RangeError: Array buffer allocation failed at new Float32Array at Ig.populateUBO at hb.addSymbols WebGL: INVALID_OPERATION: useProgram: program not valid WebGL: INVALID_OPERATION: getUniformLocation: program not linked WebGL: INVALID_OPERATION: getAttribLocation: program not linked WebGL: CONTEXT_LOST_WEBGL: loseContext: context lost WebGL: INVALID_OPERATION: delete: object does not belong to this context WebGL: INVALID_OPERATION: deleteVertexArray: object does not belong to this context WebGL: too many errors, no more errors will be reported to the console for this context. Image "pin-inactive" could not be loaded. Please make sure you have added the image with map.addImage() or a "sprite" property in your style. You can provide missing images by listening for the "styleimagemissing" map event. ```