Add dynamic V4L2 test pattern controls to emulated_camera_mplane#2845
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Implement support for dynamic video test patterns and their associated V4L2 control handlers. Supported patterns include: - Pattern 0 (Legacy Pulse): Uniform color-cycling. - Pattern 1 (SMPTE + Bouncing Box): Full color SMPTE bars with an animated inverse-color bouncing box overlay, adapted for the 3-sink layout and 640x480 resolution. - Pattern 2 (Animated Julia Set): CPU-intensive fractal pattern simulation for high-load host load scenarios. Supports V4L2_CID_TEST_PATTERN and V4L2_CID_IMAGE_PROC_CLASS via the VirtioMediaIoctlHandler implementation. Bug: b/490699808
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Implement support for dynamic video test patterns and their associated
V4L2 control handlers. Supported patterns include:
inverse-color bouncing box overlay, adapted for the 3-sink layout and
640x480 resolution.
for high-load host load scenarios.
Supports V4L2_CID_TEST_PATTERN and V4L2_CID_IMAGE_PROC_CLASS via the
VirtioMediaIoctlHandler implementation.
Bug: b/490699808